
© Igor Kovalchuk | ShutterstockWhether you're a righty or lefty may say more about you than what hand you use to write or play sports.
To get a sense of human handedness, take a survey of those combination chair-desk furniture pieces in classrooms. The desktops tend to wrap around from the right. That's so right-handers can comfortably rest their arms while jotting down notes with their dominant hand. For that uncommon left-hander, if he or she is lucky, there might be an odd-looking desk or two with an oppositely molded desktop.
Such classroom chauvinism reflects the puzzlingly strong bias toward
right-hand dominance in our species. All over the planet, nine out of 10 people, on average, favor their right hand for writing, throwing and so on. ("Footedness" roughly follows this same breakdown, though for sensory organs, such as eyes and ears, preference is less skewed;
true ambidexterity occurs in less than 1 percent of the population.)
Despite more than a century and a half of research, scientists have yet to find an answer for what causes handedness. "It's a very good question but we don't know," said David P. Carey, a neuropsychologist at Bangor University in the U.K.
Clues relating to asymmetries in our bodies, and especially in the brain, however, could help explain the paucity of "south paws."
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