Category: Earth

Green and blue.

  • In 2024, Air and Ocean Temperatures Break New Records

    In 2024, Air and Ocean Temperatures Break New Records

    In 2024, air temperatures and ocean temperatures once again reached record highs. According to climate researchers, ocean temperatures down to depths of 2,000 meters were higher than ever recorded.

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    The world’s oceans absorbed an additional 16 zettajoules of heat energy compared to 2023—equivalent to 140 times the global electricity production.
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    This heat absorption alone raised sea levels by one millimeter and contributed to extreme weather events worldwide.

    Oceans: The Planet’s Key Climate Buffer

    Oceans serve as the most crucial climate buffer for our planet, absorbing more than 90% of the heat generated by human-induced greenhouse effects. In recent years, ocean temperatures and heat uptake have repeatedly set new records, with significant consequences: marine heatwaves are becoming more frequent, the oxygen content of seawater is decreasing, and its stratification is becoming more resistant to mixing.

    Ocean Heat Content Since 1958: 16 Trillion Joules More in One Year

    2024 was the warmest year on record and the first in which the average annual temperature surpassed 1.5 degrees of warming compared to pre-industrial levels, confirmed by data as early as December 2024. New figures also reveal the state of the oceans, breaking another record. An international team led by Lijing Cheng from the Institute of Atmospheric Physics at the Chinese Academy of Sciences analyzed three datasets reflecting the temperatures and heat uptake of oceans down to 2,000 meters in 2024.

    The results: “In 2024, the surface temperature and heat content of the upper 2,000 meters reached unprecedented levels,” Cheng and his colleagues reported. Ocean heat content exceeded 2023’s record by an additional 16 zettajoules—16 trillion joules or roughly 140 times the annual global electricity production. According to the team, this additional warming is only partially explained by the 2023/2024 El Niño event.

    Record-Breaking Trend Continues Uninterrupted

    The world map shows the hotspots of ocean warming in 2024.
    The world map shows the hotspots of ocean warming in 2024. Credit: Cheng and others.

    2024 continues the unrelenting trend of ocean overheating. “The sequence of annual records now resembles a broken record,” says Cheng. The data indicates that annual ocean heat uptake has increased every year over the last five years, regardless of fluctuations caused by the El Niño/La Niña phenomenon.

    “This aligns with findings that Earth’s energy balance is no longer in equilibrium,” the researchers explain.

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    This imbalance is also reflected in sea surface temperatures, which reached new highs in 2024. “The annual mean sea surface temperature for 2024 is an astonishing 0.61 degrees above the long-term average from 1981 to 2010,” Cheng and his team noted.

    Mediterranean Particularly Affected

    The increasing ocean warming is evident in nearly all major oceans: “Six out of eight marine regions reached record-high heat content in 2024,” the scientists report. This includes the Indian Ocean, the tropical and northern Atlantic, the North Pacific, and the Southern Ocean around Antarctica.

    However, the most pronounced warming occurred in the Mediterranean: “It shows the highest warming rate, with a heat content increase of 1.1 zettajoules compared to 2023—more than any of the other seven regions,” the team noted. “This signal is also very robust.” The Mediterranean’s heat uptake in 2024 was five times higher than the average over the last 20 years.

    Rising Sea Levels, Extreme Weather, and Global Heat

    The recent figures highlight alarming developments in Earth’s climate, according to the research team. “The ocean is our guardian of planetary warming, as it serves as the main sink for excess heat in the Earth’s climate system,” says co-author Karina von Schuckmann from Mercator Ocean International. Because oceans show far less monthly and annual variability than land or air, ocean data is considered particularly robust and reliable.

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    However, ocean warming also has direct consequences for people and the environment. Thermal expansion of seawater drives sea level rise.

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    The 16 zettajoules of additional heat absorbed in 2024 alone raised sea levels by one millimeter, the researchers report. Warmer oceans also heat land areas, contributing to new global temperature records. In 2024, the global average temperature surpassed the 1.5-degree threshold for the first time since pre-industrial levels.

    Another consequence is an increase in extreme weather events, particularly storms and heavy rainfall. Warmer oceans evaporate more water, increasing atmospheric water vapor. This vapor not only acts as a potent greenhouse gas but also fuels storms. “It powers storms of all kinds, raising the risk of floods, hurricanes, and typhoons,” explains co-author Kevin Trenberth from the US National Center for Atmospheric Research.

  • 7 Tourist Attractions That Are Actually Completely Fake

    7 Tourist Attractions That Are Actually Completely Fake

    Not all cities in popular tourist countries have interesting attractions. The locals feel resentful that capitals and ancient cities have plenty to see, while they have nothing. However, the most resourceful ones don’t complain but create new attractions by hand. Books, Hollywood, and common misconceptions help them in this endeavor.

    Sherlock Holmes’ House

      The genius detective Sherlock Holmes is just a talented creation of Arthur Conan Doyle. Therefore, his house is merely a museum. Neither Holmes, nor Mrs. Hudson, nor Dr. Watson ever lived there. Every child knows that.

      However, a lesser-known fact is that the Sherlock Holmes museum is not located at 221B Baker Street but at 239 Baker Street. The address Doyle mentioned in the books does not actually exist on that street.

      Bridge on the River Kwai

      Bridge on the River Kwai
      Image: Wikimedia

        One of Thailand’s main attractions, topping the list of local historical tours. After all, who wouldn’t want to see the bridge built by prisoners of war, the same one from David Lean’s film of the same name! But here come two deceptions.

        First, the bridge built by the POWs was blown up in 1944. Tourists are shown only a replica, built by regular workers with modern technology, for money, and without suffering.

        Second, the river is not called Kwai but Mae Klong. Furthermore, the film “The Bridge on the River Kwai” was never filmed in Thailand. If you want to walk in the footsteps of the director’s glory, head to Sri Lanka.

        Piz Gloria Panoramic Restaurant

        Piz Gloria Panoramic Restaurant
        Image: Schilthorn Swiss

          If you are lucky enough to visit one of Switzerland’s most beautiful peaks—Schilthorn—you’ve probably heard guides telling you that episodes of the film On Her Majesty’s Secret Service were filmed in the panoramic restaurant there. It’s hard to forget a luxurious rotating restaurant that offers a breathtaking panorama.

          But don’t rush to pay for a cup of coffee where George Lazenby, as James Bond, allegedly filmed. In fact, the scenes were filmed in a Hollywood studio, and the restaurant was built after the movie was shot.

          Juliet’s Balcony

          Juliet’s Balcony
          Image: Juliet’s balcony in Verona, Italy / spencer77/Flickr

            Juliet, like Sherlock Holmes, never existed, but that doesn’t stop fans of the young Capulet from bringing flowers and notes to Juliet’s balcony in Verona, Italy.

            It’s quite strange that a balcony was chosen to attract tourists. In Shakespeare’s play, Juliet never stepped out onto a balcony to meet Romeo, contrary to many modern theatrical interpretations. She asked Romeo not to swear by the moon while standing on a terrace, but never on a balcony.

            Shangri-La

            Ganden Sumtseling Monastery within Zhongdian County, northwestern Yunnan China.
            Image: Wikimedia

              In 2001, the Chinese county of Zhongdian was renamed after the fictional land described in James Hilton’s novel Lost Horizon—Shangri-La. Considering the abundance of Eastern temples and the stunning mountain landscapes, this kind of deception to attract tourists is met with gratitude.

              Dracula’s Castle

              Dracula’s Castle bran castle
              Image: Wikimedia

                The Romanian Bran Castle, located between Muntenia and Transylvania, is shown to tourists as the residence of Vlad III, better known as Count Dracula. However, the real Prince of Wallachia never lived in this castle.

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                Nevertheless, the writer Bram Stoker, who revived the prince’s fame and imbued him with mystical powers, was inspired by Bran Castle for his books.

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                The castle itself was built with local funds and used for defense.
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                Later, it became a royal residence.

                Sleepy Hollow

                Sleepy Hollow

                  Sometimes, city residents don’t want to profit from tourists, but the tourists persist. That was the case with Sleepy Hollow, formerly North Tarrytown. Tourists visiting Westchester County, New York, repeatedly asked to be taken to Sleepy Hollow, the town featured in Washington Irving’s book and Tim Burton’s eerie film.

                  When tourists discovered that no town by that name existed, they were so disappointed that the mayor had to rename the town to satisfy tourist demand. And it worked: Sleepy Hollow quickly became the county’s most popular attraction.

                1. 10 Misconceptions About Early Humans

                  10 Misconceptions About Early Humans

                  Ancient Humans and Dinosaurs Lived Side by Side

                  This is a common joke stereotype, often seen in popular culture, like in the cartoon “The Flintstones.” However, sometimes proponents of alternative history seriously claim this to be true. According to them, humans allegedly lived alongside dinosaurs, which is why legends of many peoples feature dragons and similar creatures.

                  Some believe humanity existed for hundreds of millions of years and thus witnessed dinosaurs. Others claim that ancient reptiles went extinct quite recently, often supporters of biblical chronology. A third group argues that humans personally eradicated all dinosaurs, turning them into meat patties, which is why they no longer exist in modern nature.

                  Just keep in mind: dinosaurs went extinct 65 million years ago, and the first hominids appeared 2-3 million years ago.

                  So, the idea that these creatures could have crossed paths is absurd.

                  That said, dinosaurs could have seen our distant ancestor, the small mammal Purgatorius, the earliest known primate. It resembled a mix between a squirrel and a mouse, was no more than 15 cm long, and most likely had no idea its descendants would launch rockets into space and dominate the planet.

                  As for certain ancient world artifacts where early humans are depicted alongside dinosaurs, these are all fakes, created for cheap sensationalism. For instance, on the famous Ica stones found in South America, even reptiles that never existed there are depicted — yet they’re easily recognizable.

                  Prehistoric Humans Loved Clubs

                  Another stereotype about early humans is their fondness for huge clubs. In movies, cartoons, and comics, ancient humans are always seen carrying cone-shaped heavy branches, using them to hunt or defend against predators like saber-toothed tigers (most of which, by the way, went extinct before humans appeared). When not in use, the club is slung over the shoulder or used as a walking stick.

                  In reality, there is no significant evidence of widespread use of clubs by early humans.

                  They mostly hunted with spears tipped with stone points or sharpened sticks hardened by fire. Axes could also be used for blows, but spears were the primary weapon.

                  A spear could inflict far more serious damage to an animal or another human than a stick. Plus, thrusting is easier, and a spear can be thrown if necessary. So, clubs were unlikely to be a common weapon, though hitting small animals with sticks wasn’t out of the question.

                  The stereotypical image of a hairy man with a huge club probably originated a long time ago, perhaps in the Middle Ages, and persisted to this day.

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                  In European mythology from the 1200s, there were forest-dwelling half-animal barbarians covered in fur who fought with heavy branches. This is how early humans are commonly depicted now, even though it’s inaccurate.

                  And They Lived in Caves

                  The very name “caveman” suggests where they supposedly lived. The term comes from the word “troglodyte,” which in Greek means “cave dweller.” Ancient authors like Herodotus and Pliny used this term to describe savages living on the western coast of the Red Sea.

                  Later, the naturalist Carl Linnaeus used this word to label the supposed wild, ape-like ancestors of humans. Today, laypeople habitually call all fossil human ancestors “cavemen” and “troglodytes.” But this term is essentially incorrect. Early humans rarely lived in caves: they were dark, damp, and drafty.

                  Our ancestors were nomadic, moving from place to place in search of food and didn’t specifically settle in caves.

                  If a suitable cave appeared along the way, where they could set up a temporary camp, great, but people could get by without it.

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                  Caves were more often used as storage or for ritual purposes — for example, to pray to spirits.
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                  Archaeological finds in caves are more common not because people lived there more frequently, but because such locations have a higher chance of preserving artifacts. Open-air camps were quickly washed away by rain, while in secluded caves, they remained untouched for thousands of years.

                  Moreover, caves were often homes to predators like bears and leopards, which dragged their prey there to avoid sharing it with hyenas. So, “cavemen” didn’t always enter caves voluntarily.

                  Early Humans Were Much Healthier Than Modern Ones

                  The idea of a club-wielding prehistoric human persists for a reason. For some reason, it’s believed they were much stronger and healthier than modern people: they lived in harmony with nature, ate only healthy, natural food (or were even vegans), and had constant physical activity.

                  In contrast, modern weaklings sit in their offices all day and only occasionally lift dumbbells.

                  In reality, you can’t call the life of a early human healthy. Studies of human remains from the Paleolithic, Mesolithic, and Neolithic periods show they suffered from infections, rickets, dental problems, and numerous chronic diseases.

                  Early humans certainly had plenty of physical activity, and it was strenuous. But due to heavy labor, our ancestors experienced spinal microfractures, spondylolysis, hyperextension, lower back twists, and osteoarthritis.

                  Men lived slightly better than women, as hunters received more nutritious food and didn’t risk dying in childbirth. But they more often died in encounters with wild animals. On average, people lived between 30 and 40 years, and such a life can hardly be called healthy. Although there might have been some long-livers, they were likely very few.

                  Medicine was rudimentary. Diseases were treated by eating clay, applying it to the body, and using various herbs — you can imagine the effectiveness of such therapy. In severe cases, they turned to a shaman, who would perform trepanation to release evil spirits, which not everyone survived.

                  …Because They Led a Sober Lifestyle and Followed a Paleo Diet

                  No, early people were certainly not fans of a healthy lifestyle because they had no idea what that was. Their diet had nothing in common with the modern paleo diet.

                  Ancient humans could not eat as much meat and fish as modern enthusiasts of these foods do, but they consumed roots, flowers, and herbs that no present-day vegan would touch: thistles, water lilies, and reeds. They also didn’t shy away from less exotic foods like wild olives and water chestnuts.

                  But no matter how much you try, you won’t be able to replicate their diet.

                  The fact is that not only humans but the world around them has changed over millennia. All the fruits, vegetables, and roots you have access to are the result of long-term selection, and their wild forms are long gone.

                  For instance, corn was once a small weedy grass called teosinte, with only 12 kernels in its ears. Tomatoes were tiny berries, and wild ancestors of bananas had seeds.

                  Take a look at this painting, made between 1645 and 1672. This is what watermelons used to look like. And even earlier, 6,000 years ago, they were berries no bigger than 5 centimeters, as hard as walnuts, and so bitter they would give a modern person heartburn.

                  The food of early people, coarse and poorly prepared (or completely raw), pales in comparison in taste and nutrition to modern food.

                  And even in the Stone Age, people were not fans of a sober lifestyle. There is evidence that as early as 8,600 BCE, humans were using mind-altering substances: hallucinogenic mushrooms, cacti, opium poppies, and coca leaves. The very first alcoholic beverage—a fermented mixture of rice, honey, wild grapes, and hawthorn fruit—was consumed in China during the Neolithic era, about 9,000 years ago.

                  This desire for such indulgences likely came from our primate ancestors, who intentionally consumed overripe, fermented fruits to get tipsy. So don’t think that people in the past were more responsible about their health than you. Considering the harsh living conditions back then, it’s hard to blame them.

                  The Earth Used to Be Populated by Giants

                  Another common pseudo-scientific hypothesis suggests that in the past, there were extraordinarily tall human ancestors—three meters (10 feet) or more in height. Sometimes, this is used to explain the existence of the Egyptian pyramids and Stonehenge, as regular people supposedly could not have lifted the massive stones during construction, but giants could have.

                  Then, the giants left behind monuments of ancient architecture and a few skeletons before either disappearing, going extinct, flying back to Nibiru, or degenerating into people of our height.

                  However, from a scientific perspective, giant human ancestors can be lumped together with massive trolls and one-eyed ogre cannibals—there’s simply no reason to believe in any of these characters.

                  For example, the famous photograph of a giant skeleton supposedly found in India is a photomontage. The Canadian illustrator, known by the pseudonym IronKite, admits he created the image for a photo manipulation contest on Worth1000. He didn’t expect that his work would be widely circulated and that thousands of alternative history enthusiasts would use the image as evidence of ancient titans.

                  The origin story of this skeleton varies from version to version. Some claim it was found in India, while others say it was discovered in Saudi Arabia, confirming the existence of giants mentioned in the Quran.

                  But this image, like many others, is simply a fake, created for a contest and then unexpectedly going viral.

                  Sometimes, the remains of gigantic humans are mistakenly identified as the skeletons of Gigantopithecus—massive ancient orangutans. These creatures, which could grow up to 3 meters (10 feet) tall, did indeed exist, but they are no more related to humans than modern apes are.

                  And yes, if you compare the sizes of the remains of human ancestors with today’s population, you’ll notice a trend toward increasing, not decreasing, height over time. So, we are the giants compared to the people of the past, not the other way around.

                  The “Missing Link” Has Never Been Found

                  When Charles Darwin published On the Origin of Species in 1859, science had not yet discovered the intermediate forms that illustrate the possibility of one species evolving into another. Darwin considered this a weak point in his theory, but he believed that such organisms would eventually be found. And they were: a few years later, the skeleton of Archaeopteryx—a transitional form between reptiles and birds—was discovered.

                  Opponents of evolutionary theory argue that there are no transitional forms between ape-like creatures and modern humans. Therefore, humans did not share a common ancestor with present-day primates and must have emerged through some other means. But this isn’t true: since Darwin’s time, so many transitional forms have been found that it’s impossible to remember them all.

                  Cave People Had a Matriarchal Society

                  The theory that women ruled in primitive societies was popular in the 19th century. It was promoted by ethnographer Johann Jakob Bachofen.

                  In his book Mother Right, he built the following logical chain: those who possess property hold power. Since sexual relations in the Stone Age were random, determining the father of children was impossible, and they were raised solely by their mothers. Therefore, long-term intergenerational relationships were only possible between women. Mothers passed on their property to daughters, exclusively through the female line, and fathers did not participate in inheritance.

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                  Thus, women held more power in the past.

                  This sounds quite reasonable, but Bachofen based his ideas not on precise data, but on… ancient myths. He saw echoes of matriarchy in the tales of Homer—in the stories of Queen Arete of the Phaeacians and the warrior Amazons. Thus, Bachofen’s theory was purely speculative. Nevertheless, his works were highly regarded by Friedrich Engels, which is why Soviet science avoided disputing the theory of matriarchy in primitive societies.

                  However, modern studies of archaic societies show that matriarchy was extremely rare. Among the Tasmanians, Pygmies, Bushmen, Native Americans, Inuit, and other similar tribes, it was not typical. Sometimes women could hold high positions and even hunt alongside men, but there was no talk of them ruling.

                  So, purely matriarchal societies were rare and were unlikely to have been widespread among early humans.

                  Moreover, female dominance is not observed among closely related great apes.

                  Some scholars, like anthropologist Marija Gimbutas, consider the widespread presence of so-called Paleolithic Venuses—stone and bone figurines of very full-figured women—as evidence of matriarchy among early human. These figures are associated with fertility and abundance cults.

                  However, the fact that early humans made figurines of women doesn’t necessarily mean that they ruled society. Future anthropologists could just as easily argue that there was matriarchy in our time, given the number of curvaceous women posted daily on Instagram.

                  Human Development Stopped Since the Stone Age

                  Some people ask: if the theory of evolution is true, why don’t we observe the development of life forms? It seems as if changes have frozen in place—people today are no different from their great-grandparents. Even animals, birds, and plants around us are the same as centuries ago.

                  However, living organisms (including us, humans) continue to evolve. For example, over the past 20 years, evolution has been observed in beetles, mosquitoes, bedbugs, and other pests, as well as various species of fish, among others. The most noticeable changes occur in bacteria, viruses, and unicellular organisms since they reproduce faster than all others.

                  Humans also evolve, though not as rapidly, making these changes harder to observe.

                  Research in molecular genetics supports this. For instance, evolution has helped Tibetans adapt to life at high altitudes—a process that took 100 generations.

                  In short, if you want to witness human development as a biological species, you would need to live for a hundred thousand years or so. Only over such a long period will external changes become visible to the naked eye.

                  Darwin Renounced the Theory of Evolution at the End of His Life

                  The idea that Charles Darwin was the first to propose the animal origin of humans is deeply ingrained in popular consciousness. There’s also a belief that, in old age, Darwin supposedly rejected this heretical idea, but by then it was too late—his theory of evolution had already spread worldwide.

                  But this is completely untrue. Firstly, various theories about the evolution of living organisms existed before Darwin, proposed by figures such as Buffon, Lamarck, Haeckel, Huxley, and others. Even Leonardo da Vinci and Aristotle had hinted at such explanations for the origin of species.

                  Secondly, Darwin did not disavow his theory or convert to religious faith on his deathbed, as some claim. This myth was invented by Baptist preacher Elizabeth Hope three decades after Darwin’s death.

                  She fabricated a story about Darwin’s renunciation during a church service, and many believed it.

                  Later, Hope published her fictional account in the national Baptist magazine The Watchman-Examiner, from where it spread worldwide.

                  But Darwin never recanted his theory, and while he was not a militant atheist, he wasn’t particularly religious either. This was confirmed by his children, son Francis Darwin and daughter Henrietta Litchfield.

                2. 5 Facts About Volcanoes

                  5 Facts About Volcanoes

                  Volcanoes Can Create Floating Stones

                  Pumice stones lifted by the eruption fill the surface of the sea
                  Pumice stones lifted by the eruption fill the surface of the sea. The distant island is South Iwo Jima (Jan 20, 1986)

                  Yes, such stones really exist. And not in fantasy, but in real life. The only rock that can float on water is volcanic pumice. It forms from solidified lava with a high amount of gas bubbles, which make it very light and porous.

                  The more such voids the rock has, the lower its density and the better it floats on water. However, over time, the bubbles can fill with water, causing pumice to sink. Moreover, if the stone is too small, the surface tension of the water may exceed the buoyant force, causing it to sink as well.

                  Sometimes, after strong eruptions, pumice accumulates on the ocean’s surface and forms large rafts that can drift with the current. For example, in 2019, a 150 km² (58 sq mi) raft of pumice was spotted in the Pacific Ocean. However, these islands are not very stable and can quickly disintegrate due to waves and wind.

                  Volcanoes Produce Lightning and Rainbows

                  Anak Krakatau volcano erupts before and after tsunami

                  It’s well known that volcanoes produce lava and clouds of hot gases. But they also often cause more unusual natural phenomena, such as lightning.

                  Volcanic lightning, or “dirty thunderstorm,” is an electrical discharge that appears in an ash cloud rising during an eruption. This phenomenon was first recorded in 79 AD near Mount Vesuvius. Today, such lightning is often observed around the crater of the Earth’s most active volcano—Sakurajima in Japan.

                  These lightnings occur due to the difference in electrical potentials between the particles of gases and ash emitted during the eruption. The gases carry a positive charge, while the ash has a negative one. When these components collide, electrical flashes occur. Water vapor, also released during eruptions, contributes to this process.

                  The color of volcanic lightning can range from bright white to orange-red and even blue, creating an impressive contrast with the dark night sky or ash clouds.

                  This natural phenomenon has a curious side effect. When a discharge with a temperature of 30,000 °C melts ash particles and rock flying in the air during an eruption, they turn into glass beads or tubes known as fulgurites.

                  Another atmospheric phenomenon that can occur during an eruption is a rainbow. Large amounts of ash, dust, and gases are ejected into the atmosphere, interacting with moisture and clouds. If the sun is shining in the sky at the same time, its rays refract through the particles ejected by the volcano, creating a multicolored arc-shaped strip.

                  Sharks Live in Volcanoes

                  Sharks discovered inside underwater volcano

                  Volcanoes are not only terrestrial; they can also be underwater—and the latter can host their own ecosystems. After all, a hole in the Earth’s crust from which hot magma spews is not just a source of destruction but also a provider of heat, minerals, and nutrients for various plants and animals.

                  For example, archaea use chemical energy and minerals from the volcano for their metabolism. Some species of mollusks form specific communities based on symbiosis with bacteria that oxidize chemical compounds. Hydrothermal tube worms can synthesize organic substances using hydrogen sulfide energy.

                  The most unusual example of such an underwater ecosystem is the Kavachi volcano, located in the Pacific Ocean near the Solomon Islands. Despite being submerged, it occasionally erupts, creating temporary islands of lava and ash. Yet, diverse marine creatures live in its crater, including Pacific sleeper sharks and hammerhead sharks.

                  Why would these creatures enter a volcano? Scientists have yet to provide a definitive answer.

                  However, several hypotheses exist. First, sharks may use the warm water in the crater as a kind of thermostat to regulate their body temperature. Second, they may find abundant fish in the volcano, which feed on minerals, bacteria, and algae from the hot springs. Lastly, sharks might use the crater as a refuge from predators or competitors.

                  Volcanoes Produce Obsidian

                  Volcanoes Produce Obsidian
                  Obsidian boulders formed from lava flow. Image: Encyclopædia Britannica

                  People who have played Minecraft, Dwarf Fortress, or Terraria know well that when lava contacts water, obsidian forms. This is not just a game mechanic—obsidian is indeed a real volcanic rock formed from solidified magma.

                  Obsidian is primarily composed of silica and has a characteristic black, brown, or dark gray color. Its surface is very smooth and shiny, resembling glass.

                  There are also other shades: gray, green, blue, and even pink. Obsidian may contain various inclusions, gas bubbles, crystals, or bands. The final appearance and properties of the stone are influenced by factors such as the composition of the lava and the speed at which it cools.

                  Due to its unique properties, obsidian has been a valuable material for making stone tools, weapons, and ornaments for thousands of years. It has high hardness and sharp edges, making it ideal for creating weapons.

                  For example, the Maya and Aztecs used a weapon called a macuahuitl—a flat club-sword with rows of obsidian blades along its edges.

                  Imagine what could happen to a person if struck by a baseball bat studded with glass, and you’ll understand that the macuahuitl was a dangerous weapon. However, it wasn’t very effective against muskets—the conquistadors can attest to that.

                  Today, obsidian is used in jewelry and sculpture as a decorative stone. It also has potential in surgery, as extremely sharp, though fragile, scalpels can be made from it.

                  Volcanoes Affect the Climate of the Entire Planet

                  Infrared image of Mount Tambora, Sumbawa Island, Indonesia
                  Infrared image of Mount Tambora, Sumbawa Island, Indonesia. Taken from the space shuttle Endeavour at 0:54 GMT on 13 May 1992. Image: Wikimedia

                  You might think that volcanoes are distant phenomena, not influencing the lives of ordinary people. But this is a misconception. Eruptions, accompanied by ash, gas, and lava emissions, can lead to global climate change. They impact temperature, precipitation, and even atmospheric circulation. The outburst of a fiery mountain in a remote region of Oceania can easily affect the lives of people in America and Europe.

                  For example, the most powerful volcanic eruption in human history occurred on April 10, 1815, when the Tambora volcano, located on the island of Sumbawa in Indonesia, erupted. It spewed an enormous amount of ash, gas, and lava into the atmosphere, significantly contributing to its pollution. Columns of volcanic particles rose to an altitude of about 43 kilometers.

                  The eruption itself claimed around 71,000 lives—a record. Sumbawa and neighboring islands were covered with a thick layer of ash, and lava flows inundated surrounding areas. However, the most significant consequence of Tambora’s eruption was its global impact on climate.

                  Ash and gas clouds, released into the upper layers of the atmosphere, reflected a substantial portion of sunlight back into space, causing global cooling.

                  As a result, 1816 became known as the “Year Without a Summer” or the “Year of Darkness.” Many regions of Europe, North America, and Asia experienced prolonged frosts and snowfalls in June and July. Crops were destroyed. By the spring of 1817, grain prices had risen tenfold, and a severe famine ensued. The climate changes also affected people’s health, leading to the spread of diseases and epidemics.

                  However, there was a silver lining: this event also influenced literature and art. The high level of ash in the atmosphere led to unusually beautiful sunsets, which were captured in the works of many artists, including Caspar David Friedrich and William Turner. Additionally, some famous works, like Mary Shelley’s novel Frankenstein, were inspired by the cold and dark atmosphere created by the Tambora eruption.

                  The shortage of oats and the death of many horses also pushed people to develop alternative transportation technologies. As a result, German engineer Baron Karl Drais invented the prototype of the bicycle and a human-powered rail vehicle—the draisine. Hard times often spur innovation.

                3. 6 Incredible Things Plants Can Do

                  6 Incredible Things Plants Can Do

                  At first glance, plants may seem rather dull. They stand silently, photosynthesizing quietly. Not the most eventful life, right? But in reality, trees and shrubs have plenty of surprising and varied superpowers

                  Trees Communicate Using Fungi

                  Despite their outward calm, trees are quite resourceful. Evolution has forced them to develop various survival mechanisms. For example, they created the first prototype of the internet long before humanity existed.

                  You might think this sounds crazy, but it’s a scientifically confirmed fact: plants in forests share nutrients through underground fungal networks that envelop their roots.

                  Fungi live in symbiosis with trees—they help the trees in exchange for nourishment. This is called a mycorrhizal network.

                  The fungal threads transfer carbon, phosphorus, nitrogen, water, and many other substances between trees. If one tree is in the shaded understory and struggling with photosynthesis, it sends a distress signal to its more fortunate neighbors through the fungal network, and they send nutrients to help.

                  But trees of the same species don’t just help each other. Sometimes they try to harm their competitors by releasing toxic substances into the fungal network to drive out unwanted neighbors.

                  Some particularly bold plants even forgo photosynthesis entirely, relying solely on the nutrients they receive from the mycorrhizal network. It’s like tapping into your neighbor’s power line and stealing their electricity.

                  Plants Send Warnings to Their Kin About Danger

                  You might think plants are defenseless, unable to fight back when something starts eating them. That’s not entirely true—many poisonous plants exist. Even without poison, plants have developed original ways to protect themselves from being eaten.

                  For example, the cowpea, part of the legume family, can literally call for help if it’s being eaten by the caterpillars of the fall armyworm. When the larvae start munching on its leaves, the cowpea releases special phytocompounds that make the caterpillar think it’s inedible.

                  And that’s not all. Neighboring cowpea plants detect these compounds, realize a predator is nearby, and begin producing similar substances to make themselves unappetizing.

                  A similar defense mechanism is found in the common tomato, as well as in tobacco, sorghum, rice, and many other crops.

                  However, clever tomatoes have their match. Some especially cunning species of caterpillars have learned to release substances in their saliva that suppress the signals sent by the plants being eaten.

                  Trees Hire Entire Armies of Bodyguards

                  Unfortunately, most trees can’t smack aggressors with their branches like the Whomping Willow in the Harry Potter series. But that doesn’t mean they are defenseless. Some trees call on armies of tiny friends to handle their problems.

                  For example, the bullhorn acacia lives in symbiosis with ants of the species *Pseudomyrmex ferruginea*. These aggressive predators kill any insect that dares invade their territory.

                  The acacia produces special proteins that disrupt the digestion of insects and can even kill them, but these proteins are harmless to the ants. The tree feeds its protectors, and in return, they attack anything that threatens it—even livestock.

                  Moreover, the acacia lures ants to its damaged branches, which are being eaten by some predator. Using special signaling substances, the tree directs its soldiers to the aggressor and tells them who to attack.

                  Other trees not only use insects as their personal army but also feed off them. For instance, ants of the Azteca genus live in the leaves of the plant Cecropia and protect it from competing ants—like leaf cutters. Additionally, they nourish the plant: 98% of the nitrogen Cecropia gets comes from the ants’ waste.

                  Plants Pet Bees Hooked on Caffeine

                  It’s well known that a passion for coffee can become quite unhealthy. Even people with free will find it hard to resist the energizing beverage, and insects with their primitive instincts have no chance against caffeine.

                  According to research, plants from the coffee and citrus families use caffeine to attract bees—who enjoy nectar with a high caffeine content. The substance stimulates the insects’ neurons, causing them to dance more actively and attract more of their kin to pollinate the plant.

                  Caffeine, as discovered by scientists at Newcastle University in the UK, influences bee behavior to the point where they only pollinate the flowers that provide them with this substance. As a result, we end up with tricked insects hooked on alkaloids and plants that shamelessly exploit them for reproduction.

                  Some Plants Can Smell

                  It sounds crazy, but plants, like animals, use their sense of smell. As botanist Daniel Chamovitz explains, plants detect airborne odors and use them to determine, for example, the ripeness of their fruits or the presence of nearby insect predators.

                  But what’s even more amazing is that some especially cunning plants use their sense of smell not just for defense but for attack.

                  For example, Cuscuta, a parasitic vine well-known to gardeners, winds around other plants and feeds on their sap. Dr. Consuelo De Moraes, a biologist at Pennsylvania State University, claims that Cuscuta uses smell to find its victims.

                  In experiments conducted by De Moraes, the parasite ignored tomato dummies and accurately identified live tomatoes, even in the dark. The smell of the tomato helped it determine the direction in which to grow to reach its food source.

                  And They Can Even Explode

                  Meet Hura crepitans, or the sandbox tree, from the Euphorbiaceae family. In the Amazon rainforest, it’s called the dynamite tree.

                  Its pumpkin-like fruits, when ripe, literally explode, scattering spikes, seeds, and poisonous sap. The explosion is powerful enough to injure a person. Livestock frequently suffer from this tree as well.

                  Ingesting its fruits leads to cramps, vomiting, and diarrhea. So even if someone survives the explosion and reaches the pulp, they won’t go unpunished.

                  As if having grenade-like fruits wasn’t enough, the tree is also covered in sharp thorns that can cause serious injury.

                  The sap from its broken thorns causes a terrible rash, and if it gets into the eyes, blindness. Local tribes use it to poison fish.

                4. When the Mediterranean Nearly Faced Total Extinction 6 Million Years Ago

                  When the Mediterranean Nearly Faced Total Extinction 6 Million Years Ago

                  Around 6 million years ago, the Mediterranean Sea experienced a drastic environmental change. Due to tectonic movements that closed the Gibraltar Strait, isolating it from the Atlantic Ocean, the Mediterranean underwent an unprecedented drying out. Under the effects of a hot and dry climate, the sea level gradually dropped, reaching a critical point.

                  A Nearly Completely Dry Mediterranean Sea

                  Approximately 5.5 million years ago, the Mediterranean basin resembled a vast depression, its floor occupied by hypersaline water.


                  The landscape was similar to that of the current Dead Sea. In total, about 1 million cubic kilometers of salt are thought to have been deposited in the basin!

                  One can imagine the dramatic repercussions of this drying out on marine biodiversity.


                  However, the impact on ecosystems remains poorly constrained. A new study published in the journal Science has managed to quantify it. And to say the least, the Mediterranean’s marine ecosystems nearly faced extinction.

                  A Total “Reset” of Biodiversity

                  Out of the 2,006 endemic species recorded before the Messinian Crisis, only 86 survived this event. Fossil records show a 66.8% difference in species present before and after the crisis, which ended with the abrupt opening of the Gibraltar Strait 5.33 million years ago, allowing Atlantic waters to flood into the dried-up basin.

                  The current Mediterranean ecosystems were primarily built upon the arrival of species from the Atlantic.

                5. NASA Discovers a Long-Sought Global Electric Field on Earth

                  NASA Discovers a Long-Sought Global Electric Field on Earth

                  The story begins in the late 1960s. When the first space probes flew over the poles of our Earth.

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                  They detected a flux of particles escaping from our atmosphere.
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                  A kind of polar wind directed towards space. And the phenomenon immediately caught the attention of scientists.
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                  Not that they were surprised that particles escape from our atmosphere — like steam from a pot of boiling water — but they were surprised to see cold particles shooting off at supersonic speeds.

                  Physicists quickly suspected an electric field to be responsible for the phenomenon. They imagined it generated at about 250 kilometers altitude. In these regions, the atoms of our atmosphere indeed decompose into electrons and ions.

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                  Given the mass differences between the two, one might expect them to move away from each other due to gravity.
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                  But since electrons and ions carry opposite charges, they should generate an electric field that prevents their separation. An electric field that physicists call ambipolar because it allows ions to drag electrons towards the ground when they are subject to gravity and, conversely, electrons to lift ions towards the heights when they try to escape into space. As a consequence, there’s an increase in the height of our atmosphere and ions rise high enough to finally escape from it.

                  A Suborbital Rocket to Reveal Earth’s Electric Field

                  That’s the theory. In practice, scientists have long sought to detect such an electric field. Without success. Until today. And after several years of developing a new instrument. NASA researchers report in the journal Nature.

                  They first identified “the only rocket range in the world where you can fly through the polar wind and make the measurements” they needed for this. This place is located in Svalbard. So in May 2022, scientists set course for this Norwegian archipelago just a few hundred kilometers from the North Pole. And after about fifteen minutes of suborbital flight, their rocket, named Endurance, indeed measured a variation in electric potential! Of only 0.55 volts. About what it takes to power a watch. But enough to explain the polar wind.

                  A Weak Electric Field, But Sufficient to Explain the Polar Wind

                  “It’s more than enough to counteract the gravity acting on hydrogen ions, which are the most abundant particles in the polar wind,” says Alex Glocer, co-author of the study, in a NASA press release. With an effect ten times greater than that of gravity, “it’s even enough to eject them from our atmosphere at supersonic speeds.”

                  Researchers believe that the ambipolar field, as a fundamental field of our planet alongside gravity and magnetism, may have continuously shaped our atmosphere over time — in a way they now hope to begin exploring. And since they have now shown that a planet’s internal dynamics can create an ambipolar electric field, they suggest that similar electric fields should exist on other planets, particularly on Venus and Mars. All that remains is to measure them too…

                6. Huge Submarine Landslide Surprises Geologists

                  Huge Submarine Landslide Surprises Geologists

                  About 60,000 years ago, a mega-scale underwater landslide occurred off the coast of Morocco—the longest worldwide. It dragged about 162 cubic kilometers of mud and debris, more than 2,000 kilometers, into the Atlantic. The surprising thing, however, is that this underwater avalanche started very small and only grew to about a hundred times its volume during its course, as researchers report in Science Advances. Such rapid growth is not known from any other terrestrial landslide.

                  Mud and debris avalanches don’t just occur on land; there are also massive landslides underwater. Earthquakes, gas hydrates, or turbulence in submarine canyons can cause large sediment masses to slide off, especially on continental slopes, with catastrophic consequences. For instance, the Storegga Slide about 8,100 years ago caused large parts of the ice age Doggerland in the North Sea to sink. The previously longest underwater landslide was an avalanche that originated from the mouth of the Congo in 2020 and raced 1,100 kilometers into the Atlantic.

                  But how do such submarine landslides become mega-avalanches? For snow avalanches or landslides, it’s known how they develop and how much their volume can grow from beginning to end. For underwater landslides, however, this information has been lacking until now.

                  Underwater Landslide on a Megascale

                  Now, for the first time, researchers have managed to reconstruct the growth of an underwater landslide in one of the world’s largest submarine canyons. The Agadir Canyon begins off the coast of Morocco and is 450 kilometers long and 30 kilometers wide. The gorge, deeply cut into the African continental slope, extends to a depth of 1,200 meters into the Atlantic. Geological studies have shown that large landslides have repeatedly occurred in this canyon.

                  One of the last and largest events of this kind was the so-called “Bed 5” landslide almost 60,000 years ago. “This suspension flow comprised about 162 cubic kilometers of sediment and covered the extraordinary distance of more than 2,000 kilometers,” report Christoph Böttner from the University of Kiel and his colleagues. To clarify where and how this underwater avalanche originated and how it developed, they analyzed more than 300 sediment cores from the Agadir Canyon and its surroundings and mapped the entire submarine canyon using sonar.

                  Favored by Bud, Speed, and Giant Canyon

                  The analysis revealed the gigantic extent of the Agadir landslide: It formed an avalanche about 200 meters high that raced into the depths at breakneck speed, dragging everything around it. “This landslide was the height of a skyscraper and raced down the slope at more than 65 kilometers per hour,” reports co-author Christopher Stevenson from the University of Liverpool.

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                  “In the end, it covered an area larger than Great Britain under more than a meter of sand and mud.” The erosion traces are detectable over an area of about 4,473 square kilometers along the entire length of the canyon.

                  The enormous force and range of the underwater avalanche were made possible by a combination of several features. For one, the sediment slid off at a particularly high speed, giving the avalanche corresponding momentum.

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                  For another, the seabed in this area consisted of fine, clayey mud. “The addition of mud increases the range and transport capacity even for coarser particles,” the researchers explain. This is because the fine particles remain suspended for a long time but simultaneously promote the cohesion of the suspension flow.

                  “Ultimately, the Bed 5 event was only limited by the cross-section of the canyon,” Böttner and his team explain. “Because this is exceptionally large, the landslide could become a catastrophic, massive event.”

                  Surprisingly Small Trigger

                  But where and how did this mega-landslide originate? Böttner and his colleagues were also able to clarify this. According to their findings, the trigger must lie in the southern part of the canyon tributaries—deeply incised, branched flow beds above the beginning of the gorge. There, the entire seabed could have detached in a closed layer up to 30 meters thick. According to the researchers, this large-scale but shallow slope failure could also explain why no clear traces are visible there.

                  The surprising thing, however, is that the trigger of the massive Bed 5 landslide was relatively small—it comprised only about 1.5 cubic kilometers. This means that the underwater avalanche must have drastically increased in volume from its beginning to its end. “This means that this landslide grew at least 100 times its original size,” report Böttner and his team.

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                  Such an increase in volume is orders of magnitude greater than that of debris or snow avalanches on land.

                  Increased Risk for Coasts and Marine Infrastructure

                  According to the research team, the drastic increase in volume of this submarine landslide is not an isolated case: “We assume that this is a specific behavior of underwater avalanches,” says Böttner. “We have already seen similarly extreme growth in smaller landslides elsewhere.” However, the fact that even the largest events of this kind can have relatively small triggers is a new insight.

                  “Before this study, we thought that large submarine avalanches only originated from correspondingly large slope failures,” says senior author Sebastian Krastel from the University of Kiel. “Now we know that they can start small and then grow into extremely strong and extensive events.”