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.

Economics

Simple Interest Rate

Quick fact

Simple interest was used in ancient Babylonian loans dating back to 2000 BCE, making it one of the oldest financial calculations.

Why this is interesting

You borrow $1,000 from a friend at a 5% simple interest rate per year. After 3 years, you owe $1,150 — but why exactly $150 and not more?