Making Light has an open thread which is mostly about a probability brain teaser. I find such unspeakably boring,so I made my saving throw, but if you want extended discussion of something which is rather like the Monty Hall problem but not exactly, there it is.
However, KipW mentioned Not To Scale, a charming tile game in which the pieces rescale themselves to fit locations. The only mercy is that you don't have to rotate them.
There's also a discussion of small objects you might have with you that could stop a bullet.
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