Chronic stress can physically shrink the hippocampus, the brain region associated with memory.

The Peloponnesian War lasted nearly three decades.

Fact #1442 · Human Body

The dragonfish has bioluminescent organs along its body.

Fact #1404 · Human Body

The human brain operates on about 20 watts of power.

Fact #1744 · Human Body

Mammoths and early humans lived at the same time.

Fact #633 · Human Body

Saber-toothed cats had elongated canine teeth.

Fact #674 · Human Body

The Earth is about 4.5 billion years old.

Fact #172 · Human Body

Fossils form when organisms are preserved in sediment over millions of years.

Fact #678 · Human Body

Some insects can lift many times their body weight.

Fact #213 · Human Body