This is a view called "group selection, " because it argues that our genes came down to us today not just because some individuals were more fit than their neighbors, but because some groups were more fit (more cohesive and cooperative) than their neighboring groups.

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"This is all about the community taking charge of local, renewable electricity generation, " said Robin Mewes, managing director at Rooftop Consulting Ltd, one of the groups behind the new cooperative.

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But all age groups can readily appreciate the beauty of a cooperative bird.

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