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Human Body Facts
572 facts in Human Body. Click any fact to see its full page.
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🫀 Human Body 572
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Every hour, humans shed about 600,000 skin cells.
The average human body contains about 37 trillion cells.
Teeth are the only part of the body that cannot heal themselves.
Your small intestine is about 20 feet long — about four times your height.
The liver can regenerate itself — as little as 25% of the liver can regrow into a full organ.
Your corneas receive no blood supply — they get oxygen directly from the air.
The human body contains enough carbon to make roughly 9,000 pencils.
Red blood cells complete a full circuit of the body in about 20 seconds.
The human brain uses about 20% of the body's total energy despite being only 2% of body weight.
Your skin completely replaces itself about every 27 days.
Stomach acid is strong enough to dissolve razor blades.
The human eye can distinguish about 10 million different colors.
Your nose can detect over 1 trillion different scents.
Horses cannot breathe through their mouths — they are obligate nasal breathers.
Your genetic code is a unique combination among billions of humans.
More than half of all humans ever lived died before age 10.
Humans have survived situations once thought impossible.
The body can compensate for many injuries temporarily.
Humans can adapt to high altitudes over time.
People can survive extreme dehydration briefly.
Humans can survive weeks with minimal calories.
The heart can sometimes restart after stopping.
The human body can survive hours in freezing water in rare cases.
People can survive significant blood loss with rapid treatment.
Humans can survive with only one functioning kidney.
The brain begins to suffer damage after about 5 minutes without oxygen.
Humans can survive extreme cold longer than extreme heat.
People can survive weeks without food under certain conditions.
The human body can survive about 3 days without water.
Your brain edits out constant sensations like clothing touching your skin.
Your brain fills in your blind spot so you never see it.
The human brain is optimized for pattern recognition.
The human brain contains billions of neurons involved in thinking.
About 1 in 20 people have double-jointed fingers.
Only about 5% of people have detached retinas in their lifetime.
Only about 10% of people have a dominant left eye.
Only about 20% of people can voluntarily wiggle their ears.
Less than 1% of people have heterochromia, where eyes are different colors.
About 1 in 2,000 people are born with an extra finger or toe.
Your risk of death doubles approximately every 8 years as you age.
Roughly 60% of your body weight is water.
You blink over 20 million times per year.
Roughly 80% of people will experience back pain at some point in their lives.
About 75% of the human brain is water.
About 8% of people have an extra rib.
Your brain fills in blind spots in your vision automatically.
There are more lifeforms living in your body than human cells.
You are slightly taller when you wake up than when you go to sleep.
Your stomach gets a new lining every few days to avoid digesting itself.
Every second, your body produces millions of new cells.