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physics
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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)