You have to hand it to those extra-terrestrials: they aren’t just smart, they’re artistic and witty. Every summer since the 1970s, they have parked their UFOs in fields around the world, and set about creating beautiful patterns somewhat prosaically named “crop circles”. And this summer they’ve outdone themselves, having just created a 90-metre wide design in a field in Wiltshire, England, which contains a secret message and a mathematical joke.
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