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Close encounters

发布时间:2019-03-06 12:15:06来源:未知点击:

THE film Six Degrees of Separation describes a “small-world network” where everyone in the world can be linked to everyone else through, at most, six others. Now scientists have found that the number of “sexual links” needed to connect two people could be even fewer. Luis Amaral at Boston University and colleagues at Stockholm University analysed data from a sex survey of 2810 Swedes (Nature, vol 411, p 907). By checking how many sexual partners people had in one year, they could estimate the number of amorous links needed to connect two people. “Any two people might only be two or three connections apart,