In the 1980s Rubik's Cubes seemed to be everywhere, but there are still legions of people obsessed with the coloured puzzles. The record for a human is 5.55 seconds. A robot can do it in 3.253. Most people - despite toiling over it for hours - have probably never managed it.
But 40 years after its birth, the Rubik's Cube continues to beguile, frustrate and - like a Filofax or Walkman - evoke its 1980s heyday when schools were full of children puzzling over its brightly coloured squares.
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