Cave systems can extend for hundreds of kilometers — Mammoth Cave in Kentucky has over 660 km of mapped passages.

The immortal jellyfish (Turritopsis dohrnii) can revert to its juvenile state after reaching adulthood.

Fact #3244 · Nature

Some volcanoes can erupt underwater.

Fact #2624 · Nature

There are more trees than stars in our galaxy.

Fact #1703 · Nature

Some species of ants create underground tunnel networks.

Fact #497 · Nature

Some fish can generate electric fields.

Fact #658 · Nature

Some desert plants store water in thick, fleshy stems.

Fact #858 · Nature

There are massive structures.

Fact #2402 · Nature

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

Fact #1868 · Nature