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Beneath the waves, entire worlds are hiding. Lost continents that once hosted life, now buried under thousands of feet of water. And sometimes, when scientists dig deep enough, they find human bones. Off the coast of Indonesia, archaeologists dredged the seafloor and uncovered something impossible: a lost Ice Age continent called Sundaland. Animation is created by Bright Side.
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This video is made for entertainment purposes. We do not make any warranties about the completeness, safety and reliability. Any action you take upon the information in this video is strictly at your own risk, and we will not be liable for any damages or losses. It is the viewer's responsibility to use judgement, care and precaution if you plan to replicate.
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00:00It started as a routine cleaning to scoop some mud off the coast of Indonesia,
00:04but turned into a discovery of remnants of a lost, submerged Ice Age landmass.
00:10Archaeologists found more than 6,000 fossil fragments,
00:13and among them, 140,000-year-old Homo erectus remains.
00:17This find made scientists rethink how early humans lived, moved, and interacted in Southeast Asia.
00:26For years, they thought that Homo erectus on Java Island lived in isolation,
00:31separated from the rest of the world, but these dredged fossils blew that story apart.
00:36It turns out, Java wasn't an island at all back then, but part of a landmass called Sundaland.
00:42So, Southeast Asia stretched out like someone had drained the ocean,
00:46connecting Indonesia, Malaysia, Borneo, Thailand, and Vietnam into one gigantic landscape.
00:53Today's islands of Java, Sumatra, Borneo, and Bali were connected by river systems
00:57that probably looked like the Amazon, by forests where giant animals roamed,
01:02and by coastal plains that would later sink beneath the ocean when temperatures went up.
01:07And Homo erectus were not stuck.
01:10They were thriving in what honestly sounds like prehistoric bliss.
01:15Yep, it was nothing like we normally imagine Ice Age, a sort of frozen wasteland.
01:20Sea levels dropped more than 400 feet because so much water froze into glaciers.
01:26When all that water got locked up in ice,
01:28whole sections of the ocean floor popped out of the water like stepping stones.
01:33Suddenly, early humans didn't need boats.
01:35They could literally walk from what's now mainland Southeast Asia
01:39all the way to places that are islands today.
01:42They could do it while exploring and chasing herds across open land.
01:46It was sort of like a giant prehistoric highway system.
01:51That giant highway matters because it completely rewrites how early humans moved around.
01:56Instead of being trapped, Homo erectus had a whole continent to roam.
02:01They followed rivers, crossed valleys, and adapted to different environments
02:06the same way you learn shortcuts to the office or find new routes to your favorite coffee shop.
02:11And because everything was connected, animals wandered freely too.
02:15Tigers, elephants, super-sized cows, and turtles the size of small cars.
02:21People followed these big animals.
02:23This among the fossils pulled from the Madura Strait,
02:26such as cut-marked turtle shells and cracked open bovid bones.
02:30When you see precise cut marks on bone,
02:33it means someone was deliberately carving meat off the bone with tools they made themselves.
02:38And cracked bones mean they were taking out marrow,
02:42which was like prehistoric energy gel.
02:44Rich, fatty, and perfect when you need calories to survive.
02:48That's a level of planning and skill scientists didn't expect from Homo erectus.
02:53It pushes Homo erectus closer to species like early Homo sapiens and Denisovans when it comes to behavior.
03:00It means they weren't just surviving on scraps.
03:02They were actively pursuing animals, processing, and maybe even sharing food the same way later humans did.
03:09So, if you imagine them as slow, hunched cavemen, forget that.
03:14These people were sharp.
03:16The techniques they used to process food look eerily similar to those used by other hominids.
03:21Not just Homo erectus, we're talking Homo florenciensis, Denisovans, and early Homo sapiens.
03:28That opens the door to the possibility that these groups didn't just exist side by side.
03:33They might have interacted.
03:35Maybe they traded ideas and copied techniques.
03:38Or maybe they even interbred or shared territories.
03:41All this makes Southeast Asia look not like a series of isolated islands, but like a buzzing human ecosystem.
03:49A place where different human species crossed paths.
03:53And here's the heartbreaking part.
03:55Everything we know about this place, everything humans built, lost, and discovered there, is all underwater now.
04:03When the Ice Age ended, glaciers melted like forgotten ice cream cones on a hot sidewalk.
04:10Sea levels rose.
04:12Slowly, then quickly.
04:14Rivers flooded.
04:15Coastlines vanished.
04:16Entire human landscapes disappeared beneath the waves.
04:20Sundaland drowned over thousands of years, and the people who lived there either adapted or moved to higher ground.
04:28Archaeologists now try to interpret what these people did, how they lived, and how many human species walked that land.
04:35Every time they pull together bone or artifact from the seabed, we get one step closer to rewriting everything we
04:42thought we knew about early human migration.
04:45And the new discovery could mean that Southeast Asia may have been just as important to human evolution as Africa,
04:52the Middle East, or Europe.
04:53Looks like Sundaland wasn't a side quest, but a real mixing zone.
04:58A place where humanity experimented, adapted, learned, and evolved.
05:03Unexpected finds like this one in Indonesia keep popping up around the world and surprising scientists.
05:10Farmers in China were hoping to scoop up bat droppings for natural fertilizers inside a narrow limestone cave.
05:17But instead, they spotted pieces of fossilized bone that looked suspiciously like parts of a human skull.
05:24This skull turned out to be ridiculously old, around 300,000 years old.
05:30Scientists eventually named the fossil Maba I.
05:34The discovery happened way back in 1958, but ever since then, nobody could agree on which ancient human species this
05:41skull belonged to.
05:42During the late Middle Pleistocene, the world was basically a crowded highway of different ancient human species wandering around.
05:50Or just maybe, Maba I came from a species we've never met before.
05:55The big issue was that researchers only found part of the skull.
05:59No jaw, no other bones.
06:01So it was like trying to solve a giant puzzle with half the pieces missing.
06:04For ages, scientists guessed it might be Neanderthal.
06:09But now, they've used micro-CT scanning, which is like an x-ray superpower that lets you peek inside fossils
06:15without breaking them.
06:17That's when they noticed weird tube-like structures connecting parts of the brain case, something Neanderthals basically never had.
06:25The inside shape of the skull looked way more like Homo erectus, a much older human species.
06:31But even that wasn't a perfect match.
06:33The skull's size and shape were closer to modern humans and Neanderthals, and it showed traits Homo erectus usually didn't
06:41have.
06:42For example, it had a shorter forehead area and a thickened bregma, the meeting point between two skull bones.
06:49Maba I also had a strange dent on the forehead, almost like a bruise frozen in time.
06:54Whatever caused it, maybe a fall, maybe anemia, it happened while the person was alive.
07:00But there was no sign of infection, so that individual probably healed and kept living after whatever hit them.
07:07So Maba I doesn't match any known species perfectly, but it shares features with several and has a similar mystery
07:14fossil vibe as others found across Africa.
07:18In 1976, a famous paleontologist and her team found another human-like skull in Tanzania.
07:25That skull had features that looked surprisingly similar to Homo sapiens, even though it was unbelievably old.
07:32Scientists think it may be one of the earliest examples of our species ever discovered.
07:36That means this skull could help solve one of science's biggest questions.
07:41When exactly did Homo sapiens first show up?
07:44The sediment layer where that skull was found goes all the way back to the middle Pleistocene.
07:50That's way earlier than what old textbooks used to claim about when modern humans appeared.
07:56And then there's the skull that turned up in Zambia's broken hill or mine.
08:00Miners literally stumbled on it, plus a few other bones, completely by accident.
08:06Scientists started calling it Rhodesian Man.
08:09And at first, everyone thought it might be the big missing link between Homo erectus and Homo sapiens.
08:14But with newer research tools and better dating methods, they discovered it's around 299,000 years old.
08:22And probably belonged to someone from the species Homo heidelbergensis.
08:26Every new fossil acts like a missing puzzle piece on the giant chaotic story of human evolution.
08:32Each one helps scientists connect species that once seemed unrelated, redraw family trees, and rewrite chapters of our past we
08:40didn't even know were wrong.
08:42If you had landed on Earth a really, really long time ago, about 1.5 billion years in the past,
08:48you wouldn't have recognized our planet.
08:50At that time, all the land was stuck together in one giant supercontinent called Nuna.
08:56Which was surrounded by an endless ocean.
08:59But if you had stuck around, you'd have witnessed a planetary-scale disaster.
09:03Nuna falling apart.
09:07But the most amazing thing is that apparently, when Nuna started breaking apart, it kicked off changes that made Earth
09:13a much better place for life.
09:16Scientists used to call this part of Earth's history the boring billion.
09:19It lasted from about 1.8 billion to 800 million years ago.
09:25Not much seemed to happen during that time.
09:27Hence the name.
09:28No big climate changes.
09:30No bizarre life forms.
09:31And nothing very dramatic.
09:34Turns out the name isn't very fair.
09:36Things may have looked calm on the surface.
09:38But underneath, Earth was changing a lot.
09:42Continents were moving, splitting apart, and coming back together.
09:45Two massive supercontinents, Nuna and later Rodinia, formed and broke up during this time.
09:52When Nuna began to break apart, huge cracks opened between the drifting land pieces.
09:58Water filled those spaces, creating shallow seas.
10:01Those seas were warmer, calmer, and had more oxygen than the deep oceans that existed before.
10:08And that might have changed everything.
10:11The new seas created friendlier conditions for life to grow and change.
10:15Scientists now think they may have helped early life become more complex.
10:20They looked back 1.8 billion years and rebuilt how Earth's tectonic plates moved over time.
10:27Plus, they tracked how carbon was stored inside the planet and released into the air.
10:32The researchers did this using a new advanced computer model that gave way more detail than they had ever had
10:39before.
10:40They found out that during the 350 million years of the so-called Boring Billion,
10:45the amount of shallow seas along the edges of continents doubled.
10:50Altogether, these coastlines stretched about 81,000 miles.
10:54That's more than three times around Earth at the equator.
10:57At the same time, subduction zones, places where one tectonic plate slides under another,
11:04actually got shorter as the continents shifted around.
11:07This is important because subduction zones are where a lot of volcanoes come from.
11:14When one plate sinks under another, seawater gets dragged deep into the Earth.
11:19That water helps rocks melt, creating magma.
11:23The magma rises, erupts as volcanoes, and releases gases like carbon dioxide into the atmosphere.
11:30So when there were fewer subduction zones, there were fewer volcanoes,
11:34and less carbon dioxide was pumped into the air.
11:37It went like this.
11:39The supercontinent Nuna broke apart,
11:41and it created lots of brand new ocean floors in young seas that didn't exist before.
11:47These new ocean floors pulled carbon dioxide out of the air.
11:51Seawater flowed into cracks in the ocean floor.
11:54When that happened, carbon got trapped in rocks, forming limestone.
11:59Over time, this process locked carbon away inside Earth instead of letting it stay in the atmosphere.
12:07With less carbon dioxide, Earth slowly cooled down.
12:11That cooler climate helped the new shallow seas become stable and rich in oxygen.
12:17Such calm, oxygen-filled environments are perfect for life to become more complex.
12:24Those huge shallow seas near the continents acted like safe nurseries for early life.
12:29They may have helped eukaryotes evolve faster.
12:32Eukaryotes are living things with complex cells.
12:36Cells that have parts inside them, like a nucleus that holds DNA.
12:41Every animal, plant, and fungus on Earth comes from these kinds of cells.
12:46So when eukaryotes appeared, it was a huge moment in the history of life.
12:52Scientists already knew that eukaryotes showed up during the boring billion
12:56because of fossils that are about 1 billion years old.
12:59But they didn't really know why this happened at that time.
13:03Now, scientists want to find better preserved early eukaryote fossils
13:07to learn exactly how complex life first evolved.
13:11Life on Earth started over 3 billion years ago.
13:15It began with tiny, simple microbes and slowly turned into a huge variety of living things.
13:21We still don't have a clear answer about how living things came out of that early, primordial soup.
13:27But even though there's no final answer yet,
13:30scientists have come up with several theories to try to explain how life on Earth may have started.
13:38Some scientists think lightning helped start life on Earth.
13:41The idea is pretty simple.
13:43Lightning is a powerful spark, and sparks can cause chemical reactions.
13:48In a famous experiment from 1952,
13:51scientists showed that electric sparks could turn simple gases like water vapor and methane
13:57into amino acids and sugars, which are basic building blocks of life.
14:02This suggested that lightning in early Earth storms
14:06might have helped create the first life ingredients.
14:09But later research showed Earth's early air wasn't exactly like the experiment.
14:14Still, some scientists think volcanic clouds could have had the right gases and lots of lightning,
14:21making this process possible.
14:23Other experts think life may have started on clay.
14:28One researcher suggested that tiny clay crystals could grow and stick together in patterns.
14:34As they did, they could trap simple molecules and line them up in organized ways.
14:39Think of clay as a kind of early organizer.
14:43Today, DNA tells molecules how to line up and work together.
14:48But what if clay had been doing a similar job before DNA even existed?
14:53It could be helping molecules arrange themselves until they eventually learned to organize on their own.
15:00This idea was interesting and got a lot of attention,
15:04but most scientists don't fully accept it yet.
15:07Another popular theory is that life started at deep-sea vents on the ocean floor.
15:13These vents are cracks in Earth's crust where super-hot water shoots out from deep inside the planet.
15:20As the water rises, it picks up important chemicals like carbon and hydrogen,
15:25which are key ingredients for life.
15:27The vents are full of tiny rock spaces where these chemicals could collect, mix, and react.
15:34The rocks may have helped speed up these reactions.
15:37Even today, deep-sea vents house rich ecosystems,
15:41even though it's dark there and the whole environment is kinda extreme.
15:46Scientists are still studying this idea.
15:48In 2019, researchers even created early lifelike structures in lab conditions similar to these vents.
15:55Such an experiment showed that this theory could really work.
16:00Another idea is that life may have started under ice.
16:05Scientists believe Earth's oceans might have been covered in ice around 3 billion years ago.
16:10Sounds pretty severe, right?
16:12But the cold may have actually helped life get started.
16:16Many of the chemical building blocks of life, like simple amino acids, are more stable at low temperatures.
16:22In warmer water, these molecules break down quickly and are spread far apart.
16:28But when water freezes, it pushes those molecules together, increasing their concentration.
16:34This crowding makes chemical reactions more likely.
16:37So, let's say the molecules were packed closer together and were breaking down more slowly.
16:43In this case, they had more chances to link up and form more complex structures.
16:48Ice may have also acted like a protective blanket.
16:51It could shield the water from harmful ultraviolet radiation from the sun and from damage caused by meteor impacts.
16:59Another idea is that life didn't start on Earth at all.
17:02This theory is called panspermia, and it suggests that life came from space.
17:08Scientists know that big asteroid impacts can blast rocks off of planets.
17:13For example, rocks from Mars have been knocked into space before, and some of them ended up on Earth.
17:20Some researchers think tiny microbes might have survived inside space rocks during the journey.
17:26If that's true, life here could have started thanks to visitors from Mars or some other cosmic world.
17:33Others go even further and suggest that life could have traveled on comets or space dust from completely different star
17:40systems,
17:41hitching a ride across the galaxy.
17:44At the same time, even if panspermia is real, it doesn't fully solve the mystery.
17:50It just moves the question somewhere else.
17:53Instead of asking how life began on Earth, we'd need to ask,
17:57how did life begin anywhere in the universe?
18:00That's it for today.
18:01So hey, if you pacified your curiosity, then give the video a like and share it with your friends.
18:06Or if you want more, just click on these videos and stay on the bright side.
18:10So let's go ahead.
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