Experiences in youth shape our health in old age. That's the key lesson from the world's longest-running medical study. iStockphoto.com hide caption

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A virus called XMRV was linked to chronic fatigue syndrome in a study published in Science in 2009. Now that paper has been withdrawn. David Schumick and Joseph Pangrace/Cleveland Clinic Center for Medical Art & Photography hide caption

itoggle caption David Schumick and Joseph Pangrace/Cleveland Clinic Center for Medical Art & Photography

Watson Pharmaceuticals, a maker of generic drugs, is rolling out generic Lipitor, or atorvastatin, under a deal with Pfizer. Bill Gallery/AP hide caption

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Snake handler Subhendu Malllik holds up an Indian baby cobra hatchling after it emerged from an egg on the outskirts of Bhubaneswar, India, in June. The venomous snake is indigenous to South Asia. Asit Kumar/AFP/Getty Images hide caption

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Often times, bed bug infestations stem from a succession of inbreeding from one female's progeny. Orkin, LLC/PR NEWSWIRE hide caption

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A Kansas City family prepares a meal together. A new study finds that working mothers log more hours — and get more stressed — than working fathers while multitasking at home. (This family wasn't part of the research.) Allison Long/MCT /Landov hide caption

itoggle caption Allison Long/MCT /Landov

Overweight guys will have even more company in a few years. Justin Sullivan/Getty Images hide caption

itoggle caption Justin Sullivan/Getty Images

H5N1 avian flu viruses (seen in gold) grow inside canine kidney cells (seen in green). Cynthia Goldsmith/CDC hide caption

itoggle caption Cynthia Goldsmith/CDC

Tokay Geckos, like this one perched on a twig in suburban Quezon City, Philippines, are being hunted and killed to satisfy booming demand for them as an ingredient in alternative medicines. Bullit Marquez/AP hide caption

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