I never heard of Fermat’s principle but have always been fascinated by refraction. I like it.

I never heard of Fermat’s principle but have always been fascinated by refraction. I like it.

“Time minimizing curve” – ahh, that is a good set of words.

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I do. I’ll be looking for this book as well. Dr. Strogatz is very easy to listen to and I feel as if I understand him immediately while also being continually surprised at what he’s saying. Good combination and rare.
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Oh wow, going through the comments, somebody mentioned “the mechanical universe”., which aired in the mid 1980s on PBS.
 
Wow… I forgot how hooked I was on this stuff as a kid.
 
https://www.youtube.com/watch?v=XtMmeAjQTXc
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I can’t believe I saw all of these as a kid but I think I saw all of these as a kid.
 
The Mechanical Universe was an amazing production by CalTech in 1985 that went over, I dunno, EVERYTHING in Physics over a course of 52 episodes.
 
It may be 35 years old now but I guarantee it’s all still correct.
 
https://www.youtube.com/watch?v=BFLUa0ciMjw&list=PL8_xPU5epJddRABXqJ5h5G0dk-XGtA5cZ&index=43
 
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 Oh, except for the glass thing, which is in Episode 17. I randomly skipped to it going through the play list.
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