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Photo: Robots operated by contestants take part in a soccer game at the 2013 China Robot Competition and Robocup China in Hefei, Anhui province, on Saturday.

Bilingual: In Bloomberg View, Megan McArdle discusses new research that shows that the more couples pool their money, the happier their marriage is. These effects seem to peter out at some very high level - if you keep 5 percent of your income to yourself in order to have a little bit of discretionary spending, it won't make you any less happy than you'd be if you pool 100 percent. But people who pool 80 percent are happier than those who pool 70 percent, and so on. Couples who keep all their money to themselves are the least happy.