Today’s puzzle is a new twist on a classic genre: the “common knowledge” hat riddle in which logicians deduce facts about their hats based on what they know, and what they know others know.
An independent inquiry into the rise in young people not working or studying is under way, with its conclusions due to be published in the summer.
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Nature, Published online: 25 February 2026; doi:10.1038/d41586-026-00578-w
'Extraordinary' scale