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A male lark bunting in the Pawnee National Grassland, Colorado. The plumage quality of the males determines their reproductive success, but different aspects of the black and white markings are preferred by females in different years. This variability alters the long-term sexual selection dynamics and may favor the evolution of multiple sexual ornaments.
A Time War Over the Period We Live In
Like astronomers battling over the status of Pluto, geoscientists are revving up to settle the fate of the interval of time known as the Quaternary, as well as the status, some feel, of an entire field.
Why We're Different: Probing the Gap Between Apes and Humans
Researchers at a high-level meeting probe the ancient question of what sets the human brain apart from those of other primates.
Shell Shock Revisited: Solving the Puzzle of Blast Trauma
Even at a distance, explosions may cause lasting damage to the brain. Such findings could have big implications for arming and compensating troops.
100% Accuracy in Automatic Face Recognition
The simple process of image averaging can boost the performance of a commercial face recognition system to 100% accuracy.
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