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

Stimulated Emission Mechanism

Quick fact

A laser beam is created by stimulating atoms to emit photons in unison, resulting in coherent light with precise properties.

Why this is interesting

Did you know that a single light particle can trigger the creation of an identical one? This is how lasers work, and it’s based on a fascinating process called stimulated emission.