The brain edits memories of the past, updating them with new information. Scientists say this may help us function better in the present. But don't throw those photos away. iStockphoto hide caption

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Researchers have only recently been able to use brain scans to detect Alzheimer's risk factors in living people. iStockphoto hide caption

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Having a perfect memory can put a strain on relationships, because every slight is remembered. Katherine Streeter for NPR hide caption

itoggle caption Katherine Streeter for NPR

Playing this game won't make you feel older, unless you're already getting up there in age. iStockphoto.com hide caption

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The underlying biology of age-related memory glitches — in old mice and old people — is different from what happens with Alzheimer's, recent research suggests. Anthony Bradshaw/iStockphoto.com hide caption

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Lou Ann Schachner, 84, and Jay Schachner, 81, are volunteers with the Northwestern University SuperAging Project. They keep track of all their plans in a shared calendar. She loves to cook and study French and he is a part-time tax lawyer. Samantha Murphy for NPR hide caption

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In an experiment, people who saw a picture of a big bowl of soup before eating lunch were less hungry a few hours later than those who saw a smaller bowl, regardless of how much they ate at the meal. stuart burford photography/iStockphoto.com hide caption

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The Beatles rehearse for that night's Royal Variety Performance at the Prince of Wales Theatre in 1963. Central/Hulton Achive/Getty Images hide caption

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Researchers are using MRI scans to learn more about the brains of people with extraordinary memory. iStockphoto.com hide caption

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