Lake Baikal in Russia contains about 20% of the world's unfrozen surface freshwater.

A bolt of lightning is about one inch wide but can be miles long.

Fact #2614 · Nature

Water is the only natural substance that commonly exists as a solid, liquid, and gas on Earth.

Fact #175 · Nature

A chameleon changes color primarily for communication and temperature control.

Fact #431 · Nature

Some butterflies have wings that reflect ultraviolet light.

Fact #533 · Nature

Some insects glow through bioluminescence.

Fact #529 · Nature

The penguin’s dense feathers create a waterproof barrier.

Fact #895 · Nature

Water can erode rock over long periods of time.

Fact #194 · Nature

Tardigrades can survive extreme radiation, freezing, and even space.

Fact #1813 · Nature