The brain system evolved to focus your energy on an individual and start the mating process.

大脑系统进化，将你的精力集中于一人，并且了开始交往的过程。

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To make the part interchangeable, each individual part must be made to a size that will fit the mating part in the correct way.

为了使零件能够互换，每个零件作出的大小必须能准确地适用于与其匹配的零件。

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Since bipeds of the featherless variety generally prefer individual to group mating displays, the benefits of kin selection are less pronounced in humans.

ECONOMIST: Team players