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What does it mean that light “slows down” in glass?

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The cube shadow puzzle

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Why does light slowing imply a bend? (Beyond the tank/car analogy)

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Positioned as the hardest question on a Putnam exam (#6, 1992)

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The medical test paradox (well “paradox”)

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Three levels of understanding Bayes’ theorem

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Ellipses have multiple definitions, how are these the same?

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A challenging puzzle about subset sums

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How the Mandelbrot set is defined

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Simulating the electric field and a moving charge