Why superb fairy-wren societies may be as complex as our own

One mystery many biologists want to solve is how complexity develops in nature. And among the many social systems in the natural world, multilevel societies stand out for their complexity. Individuals first organize into ...

Prehistoric humans rarely mated with their cousins

Today, more than 10 percent of all global marriages occur among first or second cousins. While cousin-marriages are common practice in some societies, unions between close relatives are discouraged in others. In a new study, ...

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