Saved on this device

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.

Law

The Principle of Complementarity in the International Criminal Court

Quick fact

The ICC only steps in when a national court is 'unwilling' or 'unable' to genuinely prosecute. This means that even if a country's legal system is a sham, the ICC can intervene, but only after the state itself has failed to act.

Why this is interesting

If a country's courts are too weak or too corrupt to try a war criminal, who steps in? The answer, surprisingly, is not always a global police force—it's a legal principle that puts nations first.