Continent · region

Physics

Settled by: Prediction against measurement.

The laws under everything else. Physics closes a question when a prediction survives a measurement designed to break it. Its open problems are where the two great theories, quantum mechanics and general relativity, stop agreeing.

Problem spaces

Gravity and the quantum (4 problems)
The Standard Model's loose ends (5 problems)
Quantum foundations (3 problems)
Fluids and many bodies (4 problems)

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