Red and green aphids get their different colors by producing carotenoids, or color compounds. Courtesy of Charles Hedgcock, R.B.P. hide caption

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Courtesy of Charles Hedgcock, R.B.P.

The Colorful Secret Of The Pea Aphid

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How Exercise Might Help Keep Alzheimer's At Bay

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Some evidence from wild chimpanzee communities in Guinea suggests that when young chimps die, mothers continue to carry and groom them for some time. These two chimps live in captivity. iStockphoto.com hide caption

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Chimps May Mourn Lost Ones, Study Suggests

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Bob Lewis contracted a rare fungal disease called Crytococcus gattii in 2007 that is spreading through the Pacific Northwest. He and his wife, Joan, live in Portland, Ore. Jane Greenhalgh/NPR hide caption

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Jane Greenhalgh/NPR

Fungal Disease Spreads Through Pacific Northwest

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Study: Added Sugar Increases Heart Risk

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This image is from a test called "Weights," which was part of the study. Participants need to determine the relationships between the objects rather than focus on their individual properties. Courtesy of the BBC hide caption

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Courtesy of the BBC

Brain Training Games Won't Pump Up IQs, Study Says

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Dating Study Says Singles With Options Go For Hotties

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Researchers in France conducted tests on multitasking, which suggest the brain struggles to stay focused when fixed on more than two goals at one time. iStockphoto.com hide caption

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Multitasking Brain Divides And Conquers, To A Point

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Emotions Outlast The Memories That Drive Them

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The cranium of a creature who lived around 2 millions years ago, and was probably between the ages of 9 and 13 when it died. Scientists say this new species, Australopithecus sediba, may be a direct human ancestor. Brett Eloff/Courtesy of Lee Berger and the University of the Witwatersrand hide caption

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Brett Eloff/Courtesy of Lee Berger and the University of the Witwatersrand

Odd Fossil May Be Human Ancestor, Or Dead End

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About 40,000 years ago, bacteria in the stomachs of Japanese people evolved to digest nori, the seaweed that's used to wrap maki rolls. But the average person from North America doesn't carry this version of the microbe. iStockphoto.com hide caption

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How Gut Bacteria Evolved To Feast On Sushi

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In the study, miniature GPS loggers weighing just 16 grams were fitted into custom-made backpacks carried by flocks of up to 10 homing pigeons. Courtesy of Zsuzsa Akos hide caption

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Courtesy of Zsuzsa Akos

Backpacked Birds Reveal Who's The Boss

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Zinc Levels In Poligrip Scrutinized

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The EPA says tens of thousands of dogs and cats have gotten sick and hundreds have died from pesticides applied to their skin. iStockphoto.com hide caption

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Fido Has Fleas? Be Careful; Treatment Can Go Awry

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Atom Smasher Sets New Record

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