The human body can produce vitamin D when sunlight hits skin, but this process is blocked by sunscreen.

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

Fact #2106 · Human Body

Your corneas receive no blood supply — they get oxygen directly from the air.

Fact #3275 · Human Body

Earwax has antibacterial properties and helps protect the ear canal.

Fact #3289 · Human Body

You are slightly taller when you wake up than when you go to sleep.

Fact #2713 · Human Body

The human body can survive about 3 days without water.

Fact #3064 · Human Body

Your small intestine is about 20 feet long — about four times your height.

Fact #3278 · Human Body

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

Fact #1873 · Human Body

The average human body contains enough carbon to make about 9,000 pencils.

Fact #2444 · Human Body