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- In general magnetism seems like an amazing way to transfer momentum?
- [[magnetic gears]]
- As in the little devices I've built
- Today (actually yesterday) I saw a great video on the principle of minimum action and it blew my mind a bit. It also introduced me to diffraction grating effects -- which I had heard about but hadn't grokked/seen demonstrated.
- Today (actually yesterday) I saw a great video on the [[principle of least action]] and it blew my mind a bit. It also introduced me to diffraction grating effects -- which I had heard about but hadn't grokked/seen demonstrated.
- The fact that angular momentum is quantized and has the same units as action... wow.
- This all made me think also of...
- Could you use diffraction gratings at astronomic scales to see into the past? E.g. by making visible light from a star that has taken a longer (slower) path to get to us.