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.

Sports

Sports Equipment Design

Quick fact

The first hollow carbon-fiber tennis racket, introduced in the 1970s, reduced weight by over 30% while increasing stiffness, changing how players generated power and spin.

Why this is interesting

Have you ever wondered why a tennis racket strings vibrate differently than a badminton racket's, or why a running shoe's sole has those elaborate grooves? The secret lies in sports equipment design, where every curve, weight, and material is a carefully crafted decision to help you perform better.