https://watchstrata.com 2026-11-04T15:56:30+00:00 daily 1 https://watchstrata.com/chapters 2026-11-04T15:56:30+00:00 daily 0.9 https://watchstrata.com/characters 2026-11-04T15:56:30+00:00 weekly 0.8 https://watchstrata.com/timeline weekly 0.6 https://watchstrata.com/community monthly 0.5 https://watchstrata.com/chapters/077-brazilichthys Brazilichthys: the 280-million-year-old fish with jaw holes https://i.ytimg.com/vi/64cwnSMDSgs/hqdefault.jpg Its lower fangs slid into holes in its upper jaw. https://www.youtube.com/embed/64cwnSMDSgs 2026-11-04T15:56:30+00:00 yes no no 2026-11-04T15:56:30+00:00 monthly 0.8 https://watchstrata.com/chapters/076-white-sands-gypsum White Sands: Dunes Made From 280-Million-Year-Old Gypsum https://i.ytimg.com/vi/QkwbSRszko4/hqdefault.jpg This crystal is as big as a bicycle wheel. Giant crystals like it grow at White Sands, in New Mexico. Then they crumble, and the grains blow into white sand dunes. https://www.youtube.com/embed/QkwbSRszko4 2026-11-03T15:56:47+00:00 yes no no 2026-11-03T15:56:47+00:00 monthly 0.8 https://watchstrata.com/chapters/075-the-mesosaurus-embryo Mesosaurus: a 278-million-year-old embryo inside its mother https://i.ytimg.com/vi/GBvjIDZsWMA/hqdefault.jpg Is this the oldest unborn reptile ever found? https://www.youtube.com/embed/GBvjIDZsWMA 2026-11-02T15:56:35+00:00 yes no no 2026-11-02T15:56:35+00:00 monthly 0.8 https://watchstrata.com/chapters/074-the-robledo-trackways Prehistoric Trackways: 280-million-year-old prints like a baby's hand https://i.ytimg.com/vi/kWgnyO5WQwQ/hqdefault.jpg One animal walked over fifty steps across this rock. https://www.youtube.com/embed/kWgnyO5WQwQ 2026-11-01T15:56:34+00:00 yes no no 2026-11-01T15:56:34+00:00 monthly 0.8 https://watchstrata.com/chapters/073-hallett-cove Hallett Cove: a boulder a glacier carried more than 50 km https://i.ytimg.com/vi/7QWKiAa3wBk/hqdefault.jpg A glacier carried this boulder more than fifty kilometers. https://www.youtube.com/embed/7QWKiAa3wBk 2026-10-31T15:56:37+00:00 yes no no 2026-10-31T15:56:37+00:00 monthly 0.8 https://watchstrata.com/chapters/072-gaiasia Gaiasia: a giant hunter longer than a person, 280 million years old https://i.ytimg.com/vi/fmoGDk4sFGc/hqdefault.jpg Five rocks fit together into one giant hunter. https://www.youtube.com/embed/fmoGDk4sFGc 2026-10-30T15:56:33+00:00 yes no no 2026-10-30T15:56:33+00:00 monthly 0.8 https://watchstrata.com/chapters/071-the-pollen-dusted-insects Pollen fossil insects: the oldest found, 280 million years old https://i.ytimg.com/vi/woU6UpNWeBQ/hqdefault.jpg Four hundred and twenty-five fossil insects. Only six of them had pollen. https://www.youtube.com/embed/woU6UpNWeBQ 2026-10-29T15:56:36+00:00 yes no no 2026-10-29T15:56:36+00:00 monthly 0.8 https://watchstrata.com/chapters/070-the-tortoise-on-the-pie-crust Fossil Footprints: A Tortoise Walked on Pie Crust in 1828 https://i.ytimg.com/vi/-WVmFDENAcE/hqdefault.jpg A geologist walked tortoises over pie crust. He was trying to match the first fossil footprints ever described by science. He compared the two sets of tracks, and he named the wrong animal. https://www.youtube.com/embed/-WVmFDENAcE 2026-10-28T15:56:42+00:00 yes no no 2026-10-28T15:56:42+00:00 monthly 0.8 https://watchstrata.com/chapters/069-seymouria Seymouria: the most primitive reptile that was not a reptile https://i.ytimg.com/vi/O45JtWmiiTQ/hqdefault.jpg For over thirty years, science called this a reptile. Then gills showed up on its cousins. https://www.youtube.com/embed/O45JtWmiiTQ 2026-10-27T15:56:31+00:00 yes no no 2026-10-27T15:56:31+00:00 monthly 0.8 https://watchstrata.com/chapters/068-the-mud-hill-bites Fossil Bite Marks: Oldest Sign Big Predators Ate Big Prey https://i.ytimg.com/vi/OrxhL9qnMY0/hqdefault.jpg Something bit this bone, again and again. About two hundred and eighty million years ago. https://www.youtube.com/embed/OrxhL9qnMY0 2026-10-26T15:56:33+00:00 yes no no 2026-10-26T15:56:33+00:00 monthly 0.8 https://watchstrata.com/chapters/067-cycads Cycads: an ancient family of young species https://i.ytimg.com/vi/aDSWrm42cM8/hqdefault.jpg This plant's family is older than the dinosaurs. Most of its living species are far younger. https://www.youtube.com/embed/aDSWrm42cM8 2026-10-25T15:56:25+00:00 yes no no 2026-10-25T15:56:25+00:00 monthly 0.8 https://watchstrata.com/chapters/066-cornwalls-tin Bronze Age Tin: Lost Off Israel, Most Likely From Cornwall https://i.ytimg.com/vi/72etpY8bHGY/hqdefault.jpg This tin is a long way from home. It was lost off Israel over three thousand years ago. It most likely came from Cornwall, about twenty-four hundred miles away. A trace of lead inside it points to ore about two hundred and ninety million years old. https://www.youtube.com/embed/72etpY8bHGY 2026-10-24T15:56:32+00:00 yes no no 2026-10-24T15:56:32+00:00 monthly 0.8 https://watchstrata.com/chapters/065-jharia Jharia Coal Fire: Burning Beside an Indian Town Since 1916 https://i.ytimg.com/vi/ZAMOngcITEY/hqdefault.jpg This coalfield has been on fire for a century. The first fires were reported around nineteen sixteen. Some are still burning. And the coal itself was once a forest, from before the dinosaurs. https://www.youtube.com/embed/ZAMOngcITEY 2026-10-23T15:56:33+00:00 yes no no 2026-10-23T15:56:33+00:00 monthly 0.8 https://watchstrata.com/chapters/064-the-wolfcamp Wolfcamp Shale: 3 Million Barrels a Day From Permian Mud https://i.ytimg.com/vi/enmmIEq6Jnw/hqdefault.jpg This mud yields three million barrels of oil daily. It lies deep under West Texas. Wells reach it, then turn sideways and run for miles inside it. The mud itself once settled on a sea floor. https://www.youtube.com/embed/enmmIEq6Jnw 2026-10-22T17:29:30+00:00 yes no no 2026-10-22T17:29:30+00:00 monthly 0.8 https://watchstrata.com/chapters/063-the-cave-mummies Reptile mummy: skin and ribs from 289 million years ago https://i.ytimg.com/vi/-4izuOCsbpk/hqdefault.jpg This is skin. About two hundred and eighty-nine million years old. https://www.youtube.com/embed/-4izuOCsbpk 2026-10-21T15:56:31+00:00 yes no no 2026-10-21T15:56:31+00:00 monthly 0.8 https://watchstrata.com/chapters/062-the-first-dropped-tail Lizard tail trick: a reptile did it 289 million years ago https://i.ytimg.com/vi/OmKvpP-w1VA/hqdefault.jpg This reptile just left its tail behind. About two hundred and eighty-nine million years ago. https://www.youtube.com/embed/OmKvpP-w1VA 2026-10-20T15:56:32+00:00 yes no no 2026-10-20T15:56:32+00:00 monthly 0.8 https://watchstrata.com/chapters/061-orobates Fossil robot: it walks footprints 294 million years old https://i.ytimg.com/vi/v450Gapx77s/hqdefault.jpg This robot walks in footprints older than the dinosaurs. About two hundred and ninety-four million years old. https://www.youtube.com/embed/v450Gapx77s 2026-10-19T15:56:45+00:00 yes no no 2026-10-19T15:56:45+00:00 monthly 0.8 https://watchstrata.com/chapters/060-pangaea Pangaea: The Largest Desert Earth Has Ever Had https://i.ytimg.com/vi/mgcAXGexmOU/hqdefault.jpg All the land on Earth was one piece. You could walk from near the South Pole to the far north, and never once cross the sea. And deep in the middle of it, the rain stopped coming. https://www.youtube.com/embed/mgcAXGexmOU 2026-10-18T15:56:37+00:00 yes no no 2026-10-18T15:56:37+00:00 monthly 0.8 https://watchstrata.com/chapters/059-giant-amphibians Giant Amphibians: Two-Meter Hunters of the Coal Swamps https://i.ytimg.com/vi/jQSwOigq7JM/hqdefault.jpg This amphibian is still coming out of the water. The head came out first. Keep watching. The body keeps coming. That is two meters of animal, and in these swamps, it owned the water. https://www.youtube.com/embed/jQSwOigq7JM 2026-10-17T15:56:41+00:00 yes no no 2026-10-17T15:56:41+00:00 monthly 0.8 https://watchstrata.com/chapters/058-meganeura Meganeura: A Dragonfly as Big as a Hawk https://i.ytimg.com/vi/l4NFUliY78M/hqdefault.jpg Wings wider than your shoulders. Watch it cross this gap — two seconds, trunk to trunk. And for a hundred million years, nothing else on this planet could do that at all. https://www.youtube.com/embed/l4NFUliY78M 2026-10-16T15:56:55+00:00 yes no no 2026-10-16T15:56:55+00:00 monthly 0.8 https://watchstrata.com/chapters/057-chemnitz-petrified-forest Chemnitz Petrified Forest: Buried Standing in One Eruption https://i.ytimg.com/vi/-TYr3Tv-haw/hqdefault.jpg This forest was buried standing up. It took one eruption. More than twelve feet of ash came down, and the biggest trunks never fell. They are still upright today, turned to stone, under a city in Germany. And their rings may have recorded the Sun. https://www.youtube.com/embed/-TYr3Tv-haw 2026-10-15T15:56:39+00:00 yes no no 2026-10-15T15:56:39+00:00 monthly 0.8 https://watchstrata.com/chapters/056-the-appalachians Appalachians: You're Standing Inside a Lost Mountain Range https://i.ytimg.com/vi/UR_iQ-BHoCE/hqdefault.jpg You are standing on the inside of a mountain. Not on top of one. Inside. The rock under these hills spent its early life twenty kilometers underground, inside a mountain range that is not there anymore. https://www.youtube.com/embed/UR_iQ-BHoCE 2026-10-14T15:56:35+00:00 yes no no 2026-10-14T15:56:35+00:00 monthly 0.8 https://watchstrata.com/chapters/055-hadrians-wall Hadrian's Wall: Romans built on 297-million-year-old magma https://i.ytimg.com/vi/pi7BypKYQFA/hqdefault.jpg Hadrian's Wall stands on frozen magma. https://www.youtube.com/embed/pi7BypKYQFA 2026-10-13T15:56:40+00:00 yes no no 2026-10-13T15:56:40+00:00 monthly 0.8 https://watchstrata.com/chapters/054-the-ice-age-before-the-dinosaurs The Ice Age Before the Dinosaurs: A Fjord in the Desert https://i.ytimg.com/vi/4pBzeKpBMK4/hqdefault.jpg Ice a mile thick carved this desert canyon. It is in the dry northwest of Namibia. But its floor is covered in long, straight scratches, all pointing the same way. Stones frozen into the bottom of a glacier made them. So how did a mile of ice get to Africa? https://www.youtube.com/embed/4pBzeKpBMK4 2026-10-12T15:56:30+00:00 yes no no 2026-10-12T15:56:30+00:00 monthly 0.8 https://watchstrata.com/chapters/053-the-tully-monster Tully Monster: Every Known Fossil Came From One Coal Pit https://i.ytimg.com/vi/vh7fRA9sdZs/hqdefault.jpg Every one came out of the same quarry. Every specimen of this animal that anyone has ever found, anywhere on Earth, came out of one coal pit in northern Illinois. And nobody can tell you what it is. https://www.youtube.com/embed/vh7fRA9sdZs 2026-10-11T15:56:37+00:00 yes no no 2026-10-11T15:56:37+00:00 monthly 0.8 https://watchstrata.com/chapters/052-the-first-flight Insect fossil: a landing print 310 million years old https://i.ytimg.com/vi/Ap7dUgWTQVw/hqdefault.jpg An insect landed here. About 310 million years ago. https://www.youtube.com/embed/Ap7dUgWTQVw 2026-10-10T16:28:13+00:00 yes no no 2026-10-10T16:28:13+00:00 monthly 0.8 https://watchstrata.com/chapters/051-joggins Fossil Tree: Inside It, the Oldest Reptile Anyone Had Found https://i.ytimg.com/vi/FUiP7ac1-xY/hqdefault.jpg The oldest reptile anyone had found was inside a tree. The tree had turned to stone, still standing, in a sea cliff in Nova Scotia. The skeleton was in the hollow of the trunk, and it was no longer than your hand. https://www.youtube.com/embed/FUiP7ac1-xY 2026-10-09T15:56:42+00:00 yes no no 2026-10-09T15:56:42+00:00 monthly 0.8 https://watchstrata.com/chapters/050-the-oldest-brain Fossil Fish Brain: 319 Million Years Old, Still Inside the Skull https://i.ytimg.com/vi/RsasAm4lhng/hqdefault.jpg This fish skull still has its brain inside. And the fish died about 319 million years ago. https://www.youtube.com/embed/RsasAm4lhng 2026-10-08T15:56:26+00:00 yes no no 2026-10-08T15:56:26+00:00 monthly 0.8 https://watchstrata.com/chapters/049-coal Coal: Why About Half of It Is the Same Age https://i.ytimg.com/vi/bdUmpnaiSC8/hqdefault.jpg Most coal on Earth is the same age. Not the same kind. The same age. The seams under Pennsylvania, under Yorkshire, under the Ruhr, all came out of one window of time. And then the world almost stopped making it. https://www.youtube.com/embed/bdUmpnaiSC8 2026-10-07T15:56:45+00:00 yes no no 2026-10-07T15:56:45+00:00 monthly 0.8 https://watchstrata.com/chapters/048-the-golden-age-of-sharks The Golden Age of Sharks: One Grew an Anvil on Its Back https://i.ytimg.com/vi/ibbqkklO97k/hqdefault.jpg This animal grew an anvil on its back. Then it covered the top of it in teeth. Nobody has ever worked out what it was for. https://www.youtube.com/embed/ibbqkklO97k 2026-10-06T15:56:33+00:00 yes no no 2026-10-06T15:56:33+00:00 monthly 0.8 https://watchstrata.com/chapters/047-the-second-mass-extinction The Second Mass Extinction: Between Trilobites and Dinosaurs https://i.ytimg.com/vi/hfe_o44aP1A/hqdefault.jpg This reef took twenty million years to build. The animal that built it is gone. Every one of them, everywhere, for good. And for the next hundred million years, nothing took its job. https://www.youtube.com/embed/hfe_o44aP1A 2026-10-05T15:43:41+00:00 yes no no 2026-10-05T15:43:41+00:00 monthly 0.8 https://watchstrata.com/chapters/046-horseshoe-crabs Horseshoe Crabs: 445 Million Years at the Edge of the Sea https://i.ytimg.com/vi/OAt1cgUJpXs/hqdefault.jpg This animal has walked out of five mass extinctions. And it is still walking. https://www.youtube.com/embed/OAt1cgUJpXs 2026-10-04T15:11:40+00:00 yes no no 2026-10-04T15:11:40+00:00 monthly 0.8 https://watchstrata.com/chapters/045-dunkleosteus Dunkleosteus: A Bite With the Weight of a Horse https://i.ytimg.com/vi/HwWyochpr-U/hqdefault.jpg This bite hit with the weight of a horse. There were no teeth in it. Just two blades of bone, grinding each other sharper with every bite. Nothing in its sea could stop it. https://www.youtube.com/embed/HwWyochpr-U 2026-10-03T18:30:18+00:00 yes no no 2026-10-03T18:30:18+00:00 monthly 0.8 https://watchstrata.com/chapters/044-how-fish-came-onto-land How Fish Came Onto Land: The Fish That Did a Push-Up https://i.ytimg.com/vi/_aH0N9GKUXQ/hqdefault.jpg Four Arctic summers, digging for one fish. A fish nobody had ever seen. They had only predicted it: its age, its rock, even its shape. And on the fourth summer, the rock gave it up. https://www.youtube.com/embed/_aH0N9GKUXQ 2026-10-03T11:23:26+00:00 yes no no 2026-10-03T11:23:26+00:00 monthly 0.8 https://watchstrata.com/chapters/043-prototaxites Prototaxites: The Biggest Thing on Land for 40 Million Years https://i.ytimg.com/vi/e2mCYFVxrlw/hqdefault.jpg The first one was dug up in 1859. Since then, scientists have said what it was eleven times. A tree. A seaweed. A fungus. A lichen. Not one answer has held. https://www.youtube.com/embed/e2mCYFVxrlw 2026-10-01T15:41:12+00:00 yes no no 2026-10-01T15:41:12+00:00 monthly 0.8 https://watchstrata.com/chapters/042-the-first-forests The First Forests: From Finger-High Plants to 20-Meter Trees https://i.ytimg.com/vi/Woy5qyCb1QY/hqdefault.jpg The first plants to stand up were about finger-high. Forty-five million years later, trees stood more than 20 meters tall. So how do you build a tree out of a plant with no roots, no leaves and no wood? https://www.youtube.com/embed/Woy5qyCb1QY 2026-09-30T11:39:56+00:00 yes no no 2026-09-30T11:39:56+00:00 monthly 0.8 https://watchstrata.com/chapters/041-sea-scorpions Sea Scorpions: A 2.5-Meter Hunter Known From One Claw https://i.ytimg.com/vi/d-vT-gUsrNI/hqdefault.jpg Nobody has ever dug one up. This is a sea scorpion, two and a half meters of hunter, 400 million years ago. And almost everything we say about its size is arithmetic. https://www.youtube.com/embed/d-vT-gUsrNI 2026-09-29T15:48:31+00:00 yes no no 2026-09-29T15:48:31+00:00 monthly 0.8 https://watchstrata.com/chapters/040-lungfish Lungfish: The Fish That Survives a Year in Dry Mud https://i.ytimg.com/vi/ZZcPNG8QfK4/hqdefault.jpg This fish can survive a year sealed in dry mud. Its pool is drying up around it, and it isn't leaving. https://www.youtube.com/embed/ZZcPNG8QfK4 2026-09-28T15:11:27+00:00 yes no no 2026-09-28T15:11:27+00:00 monthly 0.8 https://watchstrata.com/chapters/039-the-first-mass-extinction The First Mass Extinction: When the Ocean Left the Shore https://i.ytimg.com/vi/ES1VU4Su59I/hqdefault.jpg A crowded ocean is losing its living worlds. No rock falls from space. Ice grows, and the sea begins to pull back from the shore. https://www.youtube.com/embed/ES1VU4Su59I 2026-09-27T15:11:43+00:00 yes no no 2026-09-27T15:11:43+00:00 monthly 0.8 https://watchstrata.com/chapters/038-earths-ring Earth's Ring: Our Planet Had a Ring Like Saturn's https://i.ytimg.com/vi/Y0dKtwnmOH0/hqdefault.jpg Earth once had a ring, like Saturn. Nobody has seen it. The proof is in where the rocks came down. https://www.youtube.com/embed/Y0dKtwnmOH0 2026-09-26T15:11:28+00:00 yes no no 2026-09-26T15:11:28+00:00 monthly 0.8 https://watchstrata.com/chapters/037-anomalocaris Anomalocaris: The Half-Meter Hunter of the Cambrian Sea https://i.ytimg.com/vi/xsw9v_DLrzU/hqdefault.jpg Half a meter of animal turns toward you. Two grasping arms open. Twenty-four thousand lenses find you. This is Anomalocaris, a hunter in the Cambrian ocean about 514 million years ago. https://www.youtube.com/embed/xsw9v_DLrzU 2026-09-25T15:12:15+00:00 yes no no 2026-09-25T15:12:15+00:00 monthly 0.8 https://watchstrata.com/chapters/036-hallucigenia Hallucigenia: Scientists Thought It Was the Weirdest Animal https://i.ytimg.com/vi/o4V_Q8fAPjE/hqdefault.jpg For fourteen years, science drew this animal upside down. It stood on its spines like stilts and waved a row of tentacles at the sky. When it was finally turned over, there was a second surprise. The head was on the wrong end. https://www.youtube.com/embed/o4V_Q8fAPjE 2026-09-24T15:11:38+00:00 yes no no 2026-09-24T15:11:38+00:00 monthly 0.8 https://watchstrata.com/chapters/035-the-cambrian-explosion THE CAMBRIAN EXPLOSION - nobody agrees what switched the animals on https://i.ytimg.com/vi/IZAEVTmdGr0/hqdefault.jpg Something is looking at you out of an ocean 514 million years old. It's half a meter long, it swims fast, and its eyes hold more than 24,000 separate lenses. Twenty million years earlier, nothing like it existed. https://www.youtube.com/embed/IZAEVTmdGr0 2026-09-23T20:08:15+00:00 yes no no 2026-09-23T20:08:15+00:00 monthly 0.8 https://watchstrata.com/chapters/034-the-first-animal THE FIRST ANIMAL - seventy years to prove a smear was alive https://i.ytimg.com/vi/_tv8p3jfvbI/hqdefault.jpg Tilt the slab under a low light and an oval rises out of the stone, ribbed like a leaf. It isn't a body. It's a print: something soft settled on mud, sand buried it, the soft parts rotted, and the sand kept the shape. No shell. No bone. Nothing hard was ever in it. https://www.youtube.com/embed/_tv8p3jfvbI 2026-09-23T16:04:32+00:00 yes no no 2026-09-23T16:04:32+00:00 monthly 0.8 https://watchstrata.com/chapters/033-the-garden THE GARDEN - the seafloor was crowded, and almost nothing had a face https://i.ytimg.com/vi/C-HKmqsYukA/hqdefault.jpg Picture a seafloor so crowded you could hardly put a hand down without touching something. Bodies everywhere, some longer than your hand. And almost none of them has a mouth, an eye or a front end. https://www.youtube.com/embed/C-HKmqsYukA 2026-09-22T16:36:46+00:00 yes no no 2026-09-22T16:36:46+00:00 monthly 0.8 https://watchstrata.com/chapters/032-snowball-earth THE BIG FREEZE - the ice reached the equator, and it happened twice https://i.ytimg.com/vi/5iisWBLjQBw/hqdefault.jpg A stone the size of your fist drops through seawater and punches into soft mud. The layers bend beneath it. Floating ice carried the stone out, then let it fall. https://www.youtube.com/embed/5iisWBLjQBw 2026-09-21T16:00:20+00:00 yes no no 2026-09-21T16:00:20+00:00 monthly 0.8 https://watchstrata.com/chapters/031-great-unconformity A Billion Years Are Missing From the Grand Canyon https://i.ytimg.com/vi/k4-ZLGCMPL0/hqdefault.jpg Put one hand on a canyon wall and the other just above it. The rocks can be more than a billion years apart in age, though your hands sit only inches apart. https://www.youtube.com/embed/k4-ZLGCMPL0 2026-09-20T15:09:38+00:00 yes no no 2026-09-20T15:09:38+00:00 monthly 0.8 https://watchstrata.com/chapters/030-mitochondria MITOCHONDRIA - the cell that got swallowed and never left https://i.ytimg.com/vi/HrBfDYWrNlY/hqdefault.jpg A small cell moves inside a bigger one and stays. Picture a lodger that starts supplying power to the house. Its descendants are mitochondria (my-toe-kon-dree-uh), the tiny energy-making parts inside your cells. https://www.youtube.com/embed/HrBfDYWrNlY 2026-09-19T15:44:21+00:00 yes no no 2026-09-19T15:44:21+00:00 monthly 0.8 https://watchstrata.com/chapters/029-oklo THE NUCLEAR REACTOR - it ran itself on and off for 100,000 years https://i.ytimg.com/vi/o3Ny2BlYoOg/hqdefault.jpg Uranium ore reaches a lab with fewer fuel atoms than expected. Follow the trail back to Oklo in Gabon and you find a reactor nobody built. The rock once split atoms by itself. https://www.youtube.com/embed/o3Ny2BlYoOg 2026-09-18T16:12:41+00:00 yes no no 2026-09-18T16:12:41+00:00 monthly 0.8 https://watchstrata.com/chapters/028-slow-billion A Billion Years - the day stopped getting longer https://i.ytimg.com/vi/6K6qmPnqlBc/hqdefault.jpg Mud settles with the tides, leaving thin stripes that harden into rock. Count the pattern and you can read a kind of clock: how often Earth turned while the layers grew. https://www.youtube.com/embed/6K6qmPnqlBc 2026-09-17T11:31:29+00:00 yes no no 2026-09-17T11:31:29+00:00 monthly 0.8 https://watchstrata.com/chapters/027-deep-biosphere THE DEEP BIOSPHERE - life that survives inside rock https://i.ytimg.com/vi/7Dw0ldmT_OI/hqdefault.jpg Water creeps through a crack thinner than a hair, far below your feet. Tiny cells live there in the dark. Sunlight has never reached their walls. https://www.youtube.com/embed/7Dw0ldmT_OI 2026-09-16T15:01:05+00:00 yes no no 2026-09-16T15:01:05+00:00 monthly 0.8 https://watchstrata.com/chapters/026-sudbury Sudbury: A Canadian City Built Inside an Asteroid Crater https://i.ytimg.com/vi/Cs5xnFvT2gw/hqdefault.jpg A mine shaft drops beneath a city in Ontario. Far below, nickel and copper sit near the floor of an old lake of melted rock. A space impact gathered them there. https://www.youtube.com/embed/Cs5xnFvT2gw 2026-09-15T15:01:05+00:00 yes no no 2026-09-15T15:01:05+00:00 monthly 0.8 https://watchstrata.com/chapters/025-vredefort The Asteroid - it hit South Africa, and the hole is too big to see https://i.ytimg.com/vi/XuvbEkX9TYc/hqdefault.jpg Low hills bend across South Africa. You could stand among them and miss the crater. Time has stripped away most of the hole and left its deep roots showing. https://www.youtube.com/embed/XuvbEkX9TYc 2026-09-14T15:03:07+00:00 yes no no 2026-09-14T15:03:07+00:00 monthly 0.8 https://watchstrata.com/chapters/024-oxygen The Great Oxidation Event - Earth's first pollution disaster https://i.ytimg.com/vi/zTY1tq-gVuo/hqdefault.jpg Slice open striped iron rock and you can find layers as thin as pages in a book. Those rusty stripes began in seawater, where oxygen met dissolved iron. https://www.youtube.com/embed/zTY1tq-gVuo 2026-09-13T19:13:12+00:00 yes no no 2026-09-13T19:13:12+00:00 monthly 0.8 https://watchstrata.com/chapters/023-continents How Continents Formed: 3 Billion Years of a Moving Map https://i.ytimg.com/vi/f4KYjCwGZ2s/hqdefault.jpg Lava cools and keeps a compass reading inside it. Much later, fresh lava on the same block of land records a different tilt. The rock has moved across the face of Earth. https://www.youtube.com/embed/f4KYjCwGZ2s 2026-09-12T17:27:44+00:00 yes no no 2026-09-12T17:27:44+00:00 monthly 0.8 https://watchstrata.com/chapters/022-alien-earth Alien Earth - you get about one minute https://i.ytimg.com/vi/9pnvW-CbNYU/hqdefault.jpg Waves wash up a beach on early Earth. It looks like a place you could stand. The chapter gives you about a minute before the lack of oxygen brings you down. https://www.youtube.com/embed/9pnvW-CbNYU 2026-09-11T19:03:54+00:00 yes no no 2026-09-11T19:03:54+00:00 monthly 0.8 https://watchstrata.com/chapters/021-deepest-hole The Deepest Hole - we dug for 22 years and the planet won https://i.ytimg.com/vi/DzogDgEA3f4/hqdefault.jpg A drill chews downward, making about a tall adult's height of progress per day on average. The Kola drilling project lasts 22 years. Then hot rock starts closing the hole behind it. https://www.youtube.com/embed/DzogDgEA3f4 2026-09-10T22:16:04+00:00 yes no no 2026-09-10T22:16:04+00:00 monthly 0.8 https://watchstrata.com/chapters/020-purple-earth The Purple Earth - why life is green, and what it was before https://i.ytimg.com/vi/7d6qqt7yn10/hqdefault.jpg Hold a leaf up to the light. Some green light bounces toward your eye, while chlorophyll, the leaf's main light-catching pigment, takes in more blue and red. A pigment is a substance that absorbs some colors more than others. https://www.youtube.com/embed/7d6qqt7yn10 2026-09-09T22:35:10+00:00 yes no no 2026-09-09T22:35:10+00:00 monthly 0.8 https://watchstrata.com/chapters/019-photosynthesis Photosynthesis - the invention that will poison the world https://i.ytimg.com/vi/I5mRx3at3DY/hqdefault.jpg A thread of cells thinner than a hair sits in sunlit water. Bubbles rise. The cells are throwing away a gas that will change the sky: oxygen. https://www.youtube.com/embed/I5mRx3at3DY 2026-09-08T13:22:25+00:00 yes no no 2026-09-08T13:22:25+00:00 monthly 0.8 https://watchstrata.com/chapters/018-viruses VIRUSES - fifty million in a teaspoon, and not one on the family tree https://i.ytimg.com/vi/GZeMqHEMcvg/hqdefault.jpg Scoop up a teaspoon of seawater. It can hold about 50 million viruses, each carrying a tiny set of instructions. You cannot see the crowd in the spoon. https://www.youtube.com/embed/GZeMqHEMcvg 2026-09-07T15:11:39+00:00 yes no no 2026-09-07T15:11:39+00:00 monthly 0.8 https://watchstrata.com/chapters/017-mirror-molecules Every Protein in You Is Left-Handed. Nobody Knows Why. https://i.ytimg.com/vi/JE_SrkhMYQ0/hqdefault.jpg Put your hands palm down and try to slide one onto the other. The thumbs will not match. Some molecules have mirror twins with just the same problem. https://www.youtube.com/embed/JE_SrkhMYQ0 2026-09-06T17:09:44+00:00 yes no no 2026-09-06T17:09:44+00:00 monthly 0.8 https://watchstrata.com/chapters/016-panspermia The Parts of Life Arrived Already Made https://i.ytimg.com/vi/Y8WVS0kE2kI/hqdefault.jpg Black stones land near an Australian town. Gather the Murchison meteorite's pieces and you have about a wheelbarrow load. Hidden in that rock are parts your cells use to build proteins. https://www.youtube.com/embed/Y8WVS0kE2kI 2026-09-05T18:22:52+00:00 yes no no 2026-09-05T18:22:52+00:00 monthly 0.8 https://watchstrata.com/chapters/015-luca LUCA - every living thing has the same grandparent https://i.ytimg.com/vi/-d0bfbWATgw/hqdefault.jpg Run your family tree backward until the names run out. Keep going. Your line joins those of other animals, then plants and microbes, until all living cells share a distant ancestor. https://www.youtube.com/embed/-d0bfbWATgw 2026-09-04T16:07:32+00:00 yes no no 2026-09-04T16:07:32+00:00 monthly 0.8 https://watchstrata.com/chapters/014-ocean-vents Life - a battery at the bottom of the ocean https://i.ytimg.com/vi/P72wMjL0EjE/hqdefault.jpg Pale towers rise from cracks in a dark seafloor. At the modern Lost City vents, the tallest reaches about 197 feet (60 meters), like a building with 20 floors. Water and rock built it. https://www.youtube.com/embed/P72wMjL0EjE 2026-09-03T15:05:28+00:00 yes no no 2026-09-03T15:05:28+00:00 monthly 0.8 https://watchstrata.com/chapters/013-mars-and-the-shield Mars: Too Small to Keep Its Atmosphere https://i.ytimg.com/vi/vOjzOkrNSDk/hqdefault.jpg Air slips off Mars, atom by atom. Its pressure is so low that the chapter compares it with air above a stack of 4 Everests on Earth. You could not breathe either sky. https://www.youtube.com/embed/vOjzOkrNSDk 2026-09-02T15:53:46+00:00 yes no no 2026-09-02T15:53:46+00:00 monthly 0.8 https://watchstrata.com/chapters/012-late-heavy-bombardment The Late Heavy Bombardment - the apocalypse that may never have happened https://i.ytimg.com/vi/H_FwldAIfx8/hqdefault.jpg Moon rocks reach a lab, and their clocks seem to point to the same crash-filled age. Imagine walking into a house where the clocks all stopped together. Something big must have happened. https://www.youtube.com/embed/H_FwldAIfx8 2026-09-01T15:51:24+00:00 yes no no 2026-09-01T15:51:24+00:00 monthly 0.8 https://watchstrata.com/chapters/011-earths-water The Water - Earth was born too dry https://i.ytimg.com/vi/UgDSb9a53zE/hqdefault.jpg Wet a basketball with about 2 teaspoons of water. That is the chapter's scale picture of Earth's oceans: a thin wet coat on a huge ball of rock. How did the water get here? https://www.youtube.com/embed/UgDSb9a53zE 2026-08-31T15:02:36+00:00 yes no no 2026-08-31T15:02:36+00:00 monthly 0.8 https://watchstrata.com/chapters/010-first-rain The First Rain - Earth's entire ocean fell out of the sky https://i.ytimg.com/vi/l92rg2Kny88/hqdefault.jpg Rain falls toward glowing ground and vanishes into steam. Try to picture a whole ocean still trapped in the sky. The rock below is too hot to hold it. https://www.youtube.com/embed/l92rg2Kny88 2026-08-30T15:16:19+00:00 yes no no 2026-08-30T15:16:19+00:00 monthly 0.8 https://watchstrata.com/chapters/009-jack-hills-zircon Zircon - the oldest thing on Earth is smaller than a grain of sand https://i.ytimg.com/vi/RXs5g-vpkzI/hqdefault.jpg A speck smaller than a grain of sand sits in a rock in Western Australia. Its first home has worn away. The speck has outlasted it by billions of years. https://www.youtube.com/embed/RXs5g-vpkzI 2026-08-29T15:59:35+00:00 yes no no 2026-08-29T15:59:35+00:00 monthly 0.8 https://watchstrata.com/chapters/008-earths-core The Core: What Is Inside the Earth, All the Way Down https://i.ytimg.com/vi/4SxbGBBoxTw/hqdefault.jpg Iron rains through melted rock. Drops sink toward Earth's center, carrying gold with them. That leaves a puzzle you could dig into with a shovel: why is any gold left near the top? https://www.youtube.com/embed/4SxbGBBoxTw 2026-08-28T16:08:29+00:00 yes no no 2026-08-28T16:08:29+00:00 monthly 0.8 https://watchstrata.com/chapters/007-earth-cools Earth - why didn't a planet built from collisions just stay molten? https://i.ytimg.com/vi/WG-DrtjxCJc/hqdefault.jpg Earth glows like a campfire with no fresh wood on it. Heat escapes into the dark. A planet built from crashes is starting to cool. https://www.youtube.com/embed/WG-DrtjxCJc 2026-08-27T16:18:26+00:00 yes no no 2026-08-27T16:18:26+00:00 monthly 0.8 https://watchstrata.com/chapters/006-second-moon The Second Moon - it may still be up there, splattered across the far side https://i.ytimg.com/vi/Bbf5Ur4c1SU/hqdefault.jpg Picture a basketball with an orange beside it. In one model of the young Earth, our Moon once had a companion about a third as wide. The orange is about to meet the basketball. https://www.youtube.com/embed/Bbf5Ur4c1SU 2026-08-26T15:38:43+00:00 yes no no 2026-08-26T15:38:43+00:00 monthly 0.8 https://watchstrata.com/chapters/005-the-moon The Moon - it saved Earth before life existed https://i.ytimg.com/vi/W2puL1NGrSA/hqdefault.jpg A tide rolls around Earth, but the waves glow. This sea is melted rock. Above it hangs the new Moon, much closer than the Moon you see tonight. https://www.youtube.com/embed/W2puL1NGrSA 2026-08-25T16:09:33+00:00 yes no no 2026-08-25T16:09:33+00:00 monthly 0.8 https://watchstrata.com/chapters/004-theia Theia - the day Earth had a twin, and ate it https://i.ytimg.com/vi/oFhPqlQtdc0/hqdefault.jpg Set a grapefruit beside a basketball. That is the chapter's rough picture of Theia beside young Earth. Now imagine them crashing together. Rock melts, and glowing scraps fly into space. https://www.youtube.com/embed/oFhPqlQtdc0 2026-08-24T17:13:46+00:00 yes no no 2026-08-24T17:13:46+00:00 monthly 0.8 https://watchstrata.com/chapters/003-jupiter Jupiter - the wrecking ball that nearly ate the inner solar system https://i.ytimg.com/vi/5fKtS_CH3aM/hqdefault.jpg Jupiter plows through dust where small worlds are trying to grow. Pebbles scatter. In a model called the Grand Tack, the giant heads toward the Sun and then turns back, like a sailing ship changing course. https://www.youtube.com/embed/5fKtS_CH3aM 2026-08-23T23:33:04+00:00 yes no no 2026-08-23T23:33:04+00:00 monthly 0.8 https://watchstrata.com/chapters/002-meteorites METEORITE - you can hold something older than the Earth https://i.ytimg.com/vi/bkFs_x11jRQ/hqdefault.jpg Cut open a dark space rock and you may find beads the size of pinheads. They were drops of melted rock before Earth existed. Now you could hold them in your hand. https://www.youtube.com/embed/bkFs_x11jRQ 2026-08-21T18:48:04+00:00 yes no no 2026-08-21T18:48:04+00:00 monthly 0.8 https://watchstrata.com/chapters/001-the-sun The Sun - the day a cloud fell in on itself https://i.ytimg.com/vi/j2Ls4W_XoUE/hqdefault.jpg A cold cloud falls in on itself. Gas piles up in the middle, but there is no Sun yet. The light has to wait. https://www.youtube.com/embed/j2Ls4W_XoUE 2026-08-21T16:13:37+00:00 yes no no 2026-08-21T16:13:37+00:00 monthly 0.8 https://watchstrata.com/characters/earth https://watchstrata.com/characters/earth.webp 2026-10-07T15:56:45+00:00 monthly 0.6 https://watchstrata.com/characters/the-sun https://watchstrata.com/characters/the-sun.webp 2026-10-15T15:56:39+00:00 monthly 0.6 https://watchstrata.com/characters/jupiter https://watchstrata.com/characters/jupiter.webp 2026-08-31T15:02:36+00:00 monthly 0.6 https://watchstrata.com/characters/theia https://watchstrata.com/characters/theia.webp 2026-08-28T16:08:29+00:00 monthly 0.6 https://watchstrata.com/characters/the-moon https://watchstrata.com/characters/the-moon.webp 2026-09-17T11:31:29+00:00 monthly 0.6 https://watchstrata.com/characters/the-second-moon https://watchstrata.com/characters/the-second-moon.webp 2026-08-26T15:38:43+00:00 monthly 0.6 https://watchstrata.com/characters/mars 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