Sleep deprivation for 17 hours produces impairment equivalent to a blood alcohol level of 0.05%.

There are more possible shuffles of a deck of cards than seconds since Earth formed.

Fact #1675 · Human Body

The Earth's inner core is solid despite extreme heat.

Fact #217 · Human Body

The Peloponnesian War lasted nearly three decades.

Fact #1442 · Human Body

Ankylosaurs had armored bodies and clubbed tails.

Fact #629 · Human Body

Some birds have hollow bones to reduce body weight for flight.

Fact #889 · Human Body

The human eye can adapt to low-light conditions.

Fact #279 · Human Body

The steam engine powered early industrial machinery.

Fact #1544 · Human Body

The Hundred Years’ War lasted from 1337 to 1453.

Fact #1149 · Human Body