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.

Mathematics

Exponential Decay

Quick fact

In exponential decay, the time it takes for a quantity to halve is constant, no matter when you start measuring—this is the 'half-life', a concept used to date ancient artifacts.

Why this is interesting

You have a cup of hot coffee on a cold morning. It cools quickly at first, then slower. Why doesn't it just cool at a constant rate?