From Live Science:True love is all about finding that one certain someone, and anthropologists have led us to believe that the quest for the perfect mate is evolutionarily based. Humans are, the researchers contend, a naturally pair-boded species.
The standard scenario goes like this: Human babies are born about three months too soon because upright walking changed the female pelvis and babies have to get out before their heads grow too big. As a result, human babies are born neurologically unfinished; they can’t sit up or grasp or do much of anything. By necessity, adult humans are designed to respond to the cries and babbles of infants; we rush to feed them and pick them up. The burden of this kind of child care is so intense, they say, that it takes two parents to bring up even one baby.
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