At the Cleveland Clinic, technician Larry Raber and physician Mei Lu practice the ultrasound technique to measure CCSVI in patients with MS on medical student Claudiu Diaconu. Cleveland Clinic Center for Medical Art & Photography hide caption

itoggle caption Cleveland Clinic Center for Medical Art & Photography

These primitive tools were found on the eastern edge of the Arabian Peninsula, outside the range of Neanderthals. Researchers say humans may have left Africa earlier than previously thought, crossing what is now the bottom of the Red Sea. Science/AAAS hide caption

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Las Vegas police stand guard outside Harrah's hotel-casino in Las Vegas on Feb. 21, 2006. As officer Norman Jahn recalls, police arrested the suspected gunman without firing a shot. Jae C. Hong/AP hide caption

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During the 1980s, wildlife managers said striped bass like this one were overfished. Now, it appears that a weather pattern known as the Atlantic Multidecadal Oscillation may have been a contributing factor to the declines. Jay Fleming/Jay Fleming Photography hide caption

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Ruins of the Villa of the Quintilii on the outskirts of Rome. Gregorio Borgia/AP hide caption

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Gabrielle Giffords traveled by ambulance, private jet and helicopter from the University Medical Center in Tucson to a rehabilitation hospital in Houston on Friday. John Moore/Getty Images hide caption

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A study finds that plants in a vast area of northern California are bucking an uphill climate change trend. David McNew/Getty Images hide caption

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The decorated nest of an 11-year-old black kite. At this age, kites typically decorate their nest exuberantly. F. Sergio/AAAS/Science hide caption

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A recent survey of microbiologists across the country documented 13 episodes of microbial destruction involving viral, bacterial and fungal strains. hide caption

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Modern bedbugs are increasingly resistant to pesticides. Some populations, in fact, can survive 1,000 times the amount of pesticide that would be needed to kill a traditional bug. Orkin LLC/AP hide caption

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