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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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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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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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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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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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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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

When the first people settled in Japan, they couldn't digest a new food source — seaweed. But not long after, a beautiful microbial relationship began.

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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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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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