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The latest twist in a Canadian medical mystery – podcast
Sing when you’re winning: how karaoke in cars heralds the triumph of Chinese firms
Bankrupt DNA testing firm 23andMe to be purchased for $256m
Bees face new threats from wars, street lights and microplastics, scientists warn
Sea level rise will cause ‘catastrophic inland migration’, scientists warn
A head-scratching hat puzzle
Today’s puzzle retrospectively commemorates UNESCO’s World Logic Day, which took place last week. (The date, January 14, is both the day Kurt Gödel died and the day Alfred Tarski was born, a calendrical coincidence that links the pre-eminent logicians of the twentieth century.)
It is a logic puzzle and, as is typical for the genre, concerns a group of clever people wearing colourful headwear.
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