Humans experience about 4–6 sleep cycles per night — each cycle lasting 90 minutes with varying REM depth.

Humans can survive extreme cold longer than extreme heat.

Fact #3068 · Human Body

Humans shed about 30,000 to 40,000 dead skin cells every hour.

Fact #3628 · Human Body

Your brain can store the equivalent of millions of gigabytes of information.

Fact #1892 · Human Body

Puppies are born blind and deaf.

Fact #1344 · Human Body

The human brain uses roughly 20% of the body's total energy despite being only 2% of its weight.

Fact #3495 · Human Body

More than half of all humans ever lived died before age 10.

Fact #3089 · Human Body

Your ears never stop working, even when you're asleep — your brain just filters the sounds out.

Fact #3507 · Human Body

Your brain fills in your blind spot so you never notice it exists.

Fact #2246 · Human Body