00:00Why is it that humans can't live past 100?
00:03Not because that's our natural limit, but because 66 million years ago,
00:07the dinosaurs wrote us a death sentence, and it's still running inside your body today.
00:12In 2023, a professor at the University of Birmingham proposed a hypothesis called the
00:18longevity bottleneck. Mammals live short lives because our ancestors spent 100 million years
00:24being hunted by dinosaurs. Birds are warm-blooded. Their metabolism is faster than yours.
00:32A hummingbird's heart beats hundreds of times per minute. By the engine burns out faster logic,
00:38birds should live 3 months. But the same-sized rat lives 3 years. A bird can live 15. A giant
00:47tortoise
00:48can live until you retire. So temperature isn't the answer. Metabolism isn't the answer.
00:54The real answer takes us back 100 million years. Our ancestors were small, furry, shrew-like creatures
01:03with long snouts. They lived in burrows. They only came out at night. Most individuals never saw old age.
01:12They were eaten, starved, or died of disease. Nature is ruthlessly practical. Repairing DNA,
01:20regenerating tissue, clearing cancer cells. These are expensive processes. But when you statistically
01:28die before 2 years old, investing in long-term maintenance is pointless. So these genes were
01:34cut, one by one. Those burned blueprints are still visible in your body today. Teeth.
01:41You change teeth once. A shark changes teeth dozens of times. Next time your dentist hands you a bill,
01:50remember, you're paying for a dinosaur tax. Skin. Why do humans get sunburned? Most animals have
01:59photolitis, a built-in repair system that fixes UV damage automatically. Our ancestors, living in
02:06burrows, never saw sunlight. So this system was deleted. Now you need sunscreen. It's a patch for
02:14a feature that was deleted 100 million years ago. Look up at a mantis shrimp. It sees 4 primary colors
02:22and ultraviolet light. You have 3 cone types. Most mammals only have 2. That third color you have.
02:31We stole it back. After the dinosaurs died out, about 30 to 40 million years ago, our primate ancestors
02:39regrow that third cone cell. That's when red became red for the first time. Bats, same size as mice.
02:48Mice live 2 to 3 years. Some bats live 40 years because they fly and predators can't reach them.
02:54Naked mole rats never leave their tunnels. They can live 30 years and barely age at all.
03:02Bowhead whales, 200 plus years, because they're too big for anyone to mess with.
03:08In 2019, an Australian research team published a paper in Scientific Reports.
03:14Using a DNA clock, they measured the natural lifespan limit of two species.
03:19The bowhead whale, 268 years. Humans, 38 years. But the authors added one line.
03:29Modern humans may be the only exception to this rule. Where did those extra 40 years come from?
03:36They came from tap water. From sewage systems. From vaccines, antibiotics, anesthesia,
03:44refrigerators, fertilizer. We bypassed our genes using tools nature never planned for.
03:51Only one species took that death sentence, read it word by word, understood it, and then started
03:57rewriting it. The dinosaurs ruled this planet for 100 million years. Then a rock wiped them clean.
04:05But the sentence they passed on us. We've been serving it for 66 million years.
04:11And now we're giving ourselves a reduced sentence. So don't tell me about midlife crises.
04:18The fact that you're sitting here, finishing this video, in nature's eyes, that's already a miracle.
04:24The fact that you're eating this.
04:27You're not working constantly.
04:38You're not getting them yet.
04:46You're not being mixed.
04:47You're not being mixed.
04:48You're not making it this time the 악 mail is right.
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