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

Conservation of Momentum

Quick fact

If a stationary bomb explodes into fragments, the total momentum of all fragments remains zero in all directions—no net motion is created from nothing.

Why this is interesting

When two ice skaters push off from each other, they both glide backward. What mysterious quantity remains perfectly balanced between them?