NOBEL week, a round of lectures and ceremonies held every December in Stockholm, which climaxes with the award of the prizes themselves and a subsequent banquet, is a leisurely affair. Since prizewinners come from all over the world, that is a good thing. It gives them time to recover from their jet lag before they meet the King of Sweden, and the medals and cheques are handed over. This year, three of the prizewinners may particularly appreciate that, for they are some of the scientists who have helped explain why jet lag exists in the first place.
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