You, Inside
Human Body
Your body breaks every rule it taught you in biology class.
- 01
Why racewalkers bend like they're breaking
Racewalking looks like an alien trying to run. But every awkward hip thrust and knee bend is a carefully engineered movement that maximizes speed while obeying strict rules.
- 02
Why your nails never stop growing
Your fingernails are a non-stop factory of dead protein. From why your dominant hand grows faster to the truth about nails after death, here is how they work.
- 03
When frozen blood is a tasty summer treat
Zoo animals endure sweltering summers just like us. But for big cats and other carnivores, cooling down means a chilled, bloody delicacy.
- 04
Your belly button: a hidden blood vessel map
That tiny scar was your first grocery delivery route. And it's still connected
- 05
Your immune system sometimes snoozes
Turns out your defenses take breaks too. Here's when and why
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That Falling Jolt Just Before You Fall Asleep
You are drifting off, then your whole body jerks like you stepped off a cliff. It has a name, and it is almost always harmless.
Why Coffee Sends You Running to the Bathroom
One cup, and within minutes your colon starts working like you just ate a full meal. Even decaf does something.
Why your nails never stop growing
Your fingernails are a non-stop factory of dead protein. From why your dominant hand grows faster to the truth about nails after death, here is how they work.
When frozen blood is a tasty summer treat
Zoo animals endure sweltering summers just like us. But for big cats and other carnivores, cooling down means a chilled, bloody delicacy.
Why racewalkers bend like they're breaking
Racewalking looks like an alien trying to run. But every awkward hip thrust and knee bend is a carefully engineered movement that maximizes speed while obeying strict rules.
LASIK reshapes eyes while you watch
Imagine vision so sharp it seems like a cheat code. LASIK surgery is a quick, precise process that permanently alters your eye to make it happen.
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Octopuses have alien brains and three hearts
These smarties have blue blood and brains that work totally unlike ours
Your body swaps 330 billion cells daily
Yep, you're literally a whole new person every month or so. Wild, right?
Basketball-sized jellyfish can stop your heart
This giant bell-ringer isn't just big, it's a real heart-stopper
Your head is aging way faster than your feet
Your noggin's clock ticks quicker than your toes. Here's the real reason why
Your tailbone does more than just sit there
It's not just a leftover! Your tailbone actually supports your whole core
Hollywood babies can fool your brain
those ultra-realistic digital babies in movies? they're closer to you than you think
Every episode in You, Inside
How many neurons are in the human brain?
Which part of the human body lacks blood vessels and gets its oxygen directly from the air?
How often does your body completely replace your entire outer layer of skin?
Which precious metal is naturally found dissolved within the human bloodstream?
Explore other rabbit holes
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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.
Tardigrades, viruses and the invisible kingdoms living on you.
Dinosaurs, mass extinctions and the planet that came before this one.
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.