Only Slate Plus members can gift Slate stories. Become a member to share 10 free articles a month. From the twisted mind of brusspup comes another brain-hurting illusion. This one is really, really ...
Imagine a small light fixed to the rim of a bicycle wheel. As the bike moves, the light rises and falls in a series of arches. A long-exposure nocturnal photograph would show a cycloid, the curve ...
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