Follow your curiosity

What discovery has been shared with you?

FACTREE gives you something interesting to discover every day — and something worth talking about together.

Start with one fact. Explore it, go deeper, then follow whichever branch catches your imagination.

Choose subjects for a surprise

Exploring any topic

Begin your discovery

Your next discovery is one click away.

Choose one or more subjects above, or leave Any Topic selected and let curiosity decide.

Physics

Thermal Equilibrium

Quick fact

Thermal equilibrium is the reason thermometers work: when the thermometer reaches the same temperature as the object being measured, the reading stabilizes and indicates the object's temperature.

Why this is interesting

Have you ever wondered why a hot coffee left on the table eventually cools to the same temperature as the room, not staying hot forever?