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Loud, concussive explosions on the battlefield may last only a few seconds, but many soldiers returning from combat in the Middle East are experiencing lingering symptoms that cause them to perceive sounds even when it is quiet.

Scientists have long known that healthy cells looked and behaved differently from cancer cells. For instance, the nuclei of healthy cells -- the inner part of the cells where the chromosomes are stored -- tend to have a rounder surface than the nuclei in cancerous cells.