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

Newton's Law of Universal Gravitation

Quick fact

The gravitational force between two 1-kilogram objects 1 meter apart is only about 6.67 × 10⁻¹¹ newtons—roughly the weight of a single bacterium.

Why this is interesting

You feel weight pushing you against the ground right now—but what invisible force reaches across empty space to keep the Moon circling Earth, or to hold planets in their orbits around the Sun?