What nipple size means for evolutionary biology

Nipple size varies markedly from woman to woman, whereas male nipples are more uniform. This finding goes against a common assumption of evolutionary biology, say Ashleigh Kelly and her colleagues from the University of Queensland ...

Evolved illusion—blackest black gives bird of paradise an edge

The mating display of the male bird of paradise owes its optical extravagance to a background so black it is the envy of telescope and solar panel engineers, according to a new study published Jan. 9 in the journal Nature ...

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