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In 1977 a study of works of art that ranged from cave drawings made in 15,000 B.C. to paintings of the 1950's found that an overwhelming majority of the people in them were also right-handed, regardless of their race, country, or culture. Yet throughout the history of the human race, some people have been left-handed. Today the proportion of left-handers is 10 to 15 percent of the population worldwide. Why are most people right-handed? And what causes some to be different?

What on earth could be bad about eating low-fat foods? Quite a lot, as it turns out. Food psychologists Brian Wansink and Pierre Chandon (2006) have discovered that foods labeled as "low fat" can lead to increased consumption and contribute significantly to obesity.