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Reflect and research

1. How did Michelson and Morley demonstrate that the ether does not exist?
2. Why is 1905 the “year of physics”?
3. Give an example of a device that you use that is affected by relativistic effects.
4. How do you resolve the twin paradox? Can you show it on a space-time diagram?
5. What did Lorentz do and when?
6. Apart from the space-time interval, $$s$$, what else is Lorentz invariant?