Why is attention deficit hyperactivity disorder so common? is there an evolutionary reason why these traits are found in as many as 1 in 20 American youngsters? Such questions have prompted intriguing speculation. Harvard psychiatrist John Ratey finds no mystery in the prevalence of ADHD in the U.S. It is a nation of immigrants who, he notes, "risked it all and left their homelands." Characteristics like impulsiveness, high energy and risk taking are therefore highly represented in the U.S. gene pool. "We have more Nobel laureates and more criminals than anywhere else in the world. We have more people who absolutely...
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