Physiology

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woman weightlifting

Women exercise for fun and compete in sports, but when it comes to exercise science, men seem to matter most. 

Tockus leucomelas

Southern yellow-billed hornbills (Tockus leucomelas) lose heat through their beaks to keep cool in the Kalahari Desert of South Africa.

sperm

BOUND  Mouse sperm (left, red) flock to a polymer bead coated with the sperm-binding sections of a protein found around unfertilized eggs (illustration, right). Such beads could someday be used as contraceptives or a method for identifying healthy sperm, researchers report. 

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