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This is neat…. a sphericon is a 3-dimensional geometric solid with a single continuous face and two edges (sort of like a Möbius strip). The sphericon rolls along a wobbley path but ends up traveling in a straight line! Over at Fold Play, someone turned a pie into a sphericon – watch as it rolls …

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Shoe Lacing Math

How many ways are there to tie your shoes? Depends on the shoes, but Ian has done some calculations (under certain assumptions) to show there are over 2 trillion ways! Mathematician, Burkard Polster, published an article in the journal Nature (December 2002) about the mathematics of shoe lacing. His calculation for the number of ‘real-world’ …

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