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

Phase Transitions in States of Matter

Quick fact

Water can exist in all three states at the same time—called the triple point—at exactly 0.01°C and 611.73 pascals of pressure.

Why this is interesting

You know ice melts into water and water boils into steam—but have you ever wondered why dry ice disappears without melting, or why you can boil water at room temperature in a vacuum?