LinkedIn is an exhausting place to visit, as a rule. It attracts an inordinate number of people who are excited, pumped, psyched and stoked, usually because they have just moved jobs but sometimes because they have made it in to work in the morning. So it was sobering to see a downbeat bit of news on the site the other day. It came from Ed Whiting, strategy director at the Wellcome Trust, a large biomedical research foundation in London that jolted the world of work four months ago by saying it was thinking of testing a four-day week. The four-day idea has been on a roll in Britain. Trade union bosses have been calling for it. The Labour Party has commissioned the historian Robert Skidelsky to look into it. A few employers have tried it, lured by research suggesting shorter weeks can make people less ill and more productive. None were as big as Wellcome, which has about 800 staff. So there was understandable excitement about the news that it might join the four-day push. But Whiting...

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