Lemons float but limes sink — limes are slightly denser than water.

Certain fish form schools to reduce predation risk.

Fact #479 · Nature

Sharks existed before trees evolved.

Fact #2707 · Nature

Some fish can detect electrical fields in water.

Fact #221 · Nature

Dinosaurs lived on every continent.

Fact #730 · Nature

Some prehistoric amphibians grew several feet long.

Fact #709 · Nature

Supercell storms are responsible for many tornadoes.

Fact #842 · Nature

Bioluminescence is common among deep-sea organisms.

Fact #1418 · Nature

Some insects can walk on water due to surface tension.

Fact #374 · Nature