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.

Philosophy

Deontological Ethics and the Categorical Imperative

Quick fact

Kant argued that lying is always wrong, even to a murderer at the door asking for your friend's hiding place—because a universal law of lying would destroy trust and make promises meaningless.

Why this is interesting

You're about to hear 'it's your duty'—but what makes something a duty? Immanuel Kant's answer might surprise you: not results, not feelings, but pure reason itself.