Mathematics
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Can you solve it? Are you smarter than a Brazilian 15-year-old?A question from the tropics about string
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Atomisation of society under a chemist prime ministerLetters: Margaret Thatcher | Theatre acoustics: anthems and amplifiers | Solutions to table wobbles: tripods and Paddington Bear’s saw | Sean Hughes and Crystal Palace
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Did you solve it? The pain and pleasure of Japanese puzzlesThe solutions of today’s puzzles, and the results of the Nikoli Derby.
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Weatherwatch: Dream of forecast supercomputer that became a realityIn 1922 the mathematician Lewis Fry Richardson envisaged a vast forecast factory of human ‘computers’ replacing predictions based just on weather patterns
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Can you solve it? Are you a ninja at numbers?Outfox the other readers of this column and win a prize
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Alex Bellos's Monday puzzle Did you solve it? This traffic teaser will drive you to distraction