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500-year-old maths problem turns out to apply to coffee and clocks

A centuries-old maths problem asks what shape a circle traces out as it rolls along a line. The answer, dubbed a “cycloid”, turns out to have applications in a variety of scientific fields

Light reflecting off the round rim creates a mathematically significant shape in this coffee cup Each month, we hand over the keyboard to a physicist or mathematician to tell you about fascinating ideas from their corner of the universe. The artist Paul Klee famously described drawing as “taking a line for a walk” – but why stop there?

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