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Ghost Story Anecdote
- The restaurant owner shared a ghost story involving salt and pepper shakers flying off a counter.
- This tale serves as a humorous parallel to claims with weak evidence like ghosts.
Dark Matter Defined by Gravity
- Dark matter is an invisible form of matter that doesn't emit or absorb light.
- Physicists are confident it exists because it interacts through gravity.
Zwicky’s Early Dark Matter Evidence
- Astronomer Fritz Zwicky found galaxy speeds in the Coma cluster suggest 500 times more mass than visible matter.
- This discrepancy was the first hint at dark matter.