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.

Astronomy

How Tidal Heating Drives Activity on Jupiter's Moon Io

Quick fact

Io's volcanoes erupt with such power that plumes rise 500 kilometers above the surface, and its surface is constantly repaved—no impact craters remain.

Why this is interesting

You know Earth has volcanoes, but did you know there's a moon with more than 400 active volcanoes? What could possibly power such relentless fury?