Paul Dirac

“The Coconut Problem” Updated With Solution

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This is a famous old problem. I shall just state the problem here for you, and will follow up in a day or two with a solution and some of its amusing history. Update: Scroll down for a straightforward solution and a “trick” solution. There are also, by now, various generalizations and different versions. Here’s … Read more

Time Variation Of Pi

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Since at least as far back as the work of Dirac in 1937 (see here), there has been discussion about whether the fundamental constants of physics might vary with time. Unfortunately, some of these ideas have been stretched by young-earth creationists, in a completely unscientific way, to bolster their hypothesis that the universe was created … Read more