Bioluminescent bays glow bright blue at night when microorganisms called dinoflagellates are disturbed by movement.

Some plants respond to changes in light and touch.

The magnetic north pole moves — it has shifted hundreds of miles since it was first recorded in 1831.

Cactus spines reduce water loss and protect against herbivores.

There is enough gold inside Earth to coat the entire planet’s surface.

Avocados are technically berries — and they evolved to be eaten by giant ground sloths, which are now extinct.

Some fish can generate electric fields.

Water is the only common substance on Earth that naturally exists in all three states — solid, liquid, and gas — at everyday temperatures.

The longest recorded lightning bolt stretched hundreds of miles.