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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