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    I love these interactive websites, here’s his previous one on gears, and here is a complete list.

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      Bravo! Very cool illustrations. I love how this technique got presented:

      simple trick of projecting the outline of the subtended angle from the hemisphere onto the base

      It’s just so nice to see it made concrete with an example. And that derivation of a solid angle that makes intuitive sense was great.

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        The fact that moving the vehicle backwards in the car example turns on the reverse lights makes me very happy for some reason.