Long Ago
Ancient Earth
Dinosaurs, mass extinctions and the planet that came before this one.
- 01
Earth drowned for 2 million years straight
Imagine non-stop downpours for ages. How did anything survive that long?
- 02
Dragonflies hunted prey like tiny hawks
Modern dragonflies solve high-speed geometry problems to intercept prey mid-air, a neurological "targeting code" inherited from ancestors the size of hawks.
- 03
Antelopes have secret scent glands all over
Antelopes don't just mark territory by peeing. They have special scent glands, some even under their eyes, that squirt out a personal perfume to tell other antelopes who's boss.
- 04
Wood that refused to rot for 60 million years
Imagine trying to eat something that doesn't break down. Some ancient bugs were stuck!
- 05
How modular wooden blocks assemble houses like giant toy sets
You can build an entire insulated home without mortar, cranes, or nails using interlocking wooden blocks that snap together like giant toy bricks.
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Why human teeth cannot heal like broken bones
Snap a femur, and your body knits it back together within months. Crack a molar, and it stays broken forever. The reason comes down to a deliberate biological sacrifice.
How modular wooden blocks assemble houses like giant toy sets
You can build an entire insulated home without mortar, cranes, or nails using interlocking wooden blocks that snap together like giant toy bricks.
Your car engine runs on quick fire instead of real explosions
Drivers often think thousands of tiny explosions fire off under the hood every minute. In reality, if your engine actually exploded, the metal cylinder heads would shatter in seconds.
How manatees use solid bones and digestive gas to hover
A manatee does not paddle to stay suspended in the river. It balances solid, stone-heavy ribs against an enormous reserve of intestinal gas to float like a submarine.
Antelopes have secret scent glands all over
Antelopes don't just mark territory by peeing. They have special scent glands, some even under their eyes, that squirt out a personal perfume to tell other antelopes who's boss.
A queen bee's absence means total chaos
Take the queen bee out of her hive, and the colony doesn't just get upset; it can self-destruct in a matter of hours. Without her, the entire social structure crumbles.
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Your brain makes up memories that never happened
Your memory isn't a recording-it's a storyteller that isn't afraid to lie. Discover why your brain constantly invents high-definition memories of events that never actually happene
This school backpack is built like armor
Built from 200 parts and designed to survive six years of daily abuse, the Japanese randoseru is a $1,000 backpack that doubles as an earthquake helmet.
Mongols broke armies with a sneaky trick
Their battle plans were so clever, enemies fought each other
Museums build monsters from ancient bones
It's a bit like a giant, ancient jigsaw puzzle. Here's how they do it
Your car engine runs on quick fire instead of real explosions
Drivers often think thousands of tiny explosions fire off under the hood every minute. In reality, if your engine actually exploded, the metal cylinder heads would shatter in seconds.
A queen bee's absence means total chaos
Take the queen bee out of her hive, and the colony doesn't just get upset; it can self-destruct in a matter of hours. Without her, the entire social structure crumbles.
Every episode in Long Ago
What caused the majority of the different mineral types found on Earth today?
Where did prehistoric Megalodons leave their young to protect them from larger predators?
What allowed Meganeura, a prehistoric ancestor of the dragonfly, to grow the size of a pigeon?
What geologic evidence explains why a massive waterfall once existed at the Strait of Gibraltar?
Explore other rabbit holes
All categories →Glass frogs, immortal jellyfish, and shrimp that punch faster than bullets.
More of Earth is underwater than mapped. The strangest life on the planet hides down there.
Black holes, dying stars, and worlds where it rains diamonds.
Your body breaks every rule it taught you in biology class.
Tardigrades, viruses and the invisible kingdoms living on you.
Quantum entanglement, time dilation and experiments that broke physics.
How machines, code, and inventions actually work.
Optical tricks, memory glitches and the colours that don't really exist.
Storms, eruptions, and creatures so deadly evolution made them glow.