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.

Biology

Thermal Imaging and Prey Detection in Pit Vipers

Quick fact

Pit vipers, such as rattlesnakes and pythons, possess sensitive pit organs that can detect temperature differences as small as 0.001°C, allowing them to create a thermal image of their surroundings and strike accurately at warm-blooded prey even in total darkness.

Why this is interesting

Imagine a snake that can 'see' the warm body of a mouse in complete darkness, as if it had night-vision goggles. How does it do it?