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Left-Handed Brain New research suggests why some people are left-handed. Researchers found that they lack a gene that makes most people right-handed. The gene causes one side of brain to become bigger than the other. But people without the gene have symmetrical brains. NPR's Richard Knox reports.

Left-Handed Brain

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Left-Handed Brain

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New research suggests why some people are left-handed. Researchers found that they lack a gene that makes most people right-handed. The gene causes one side of brain to become bigger than the other. But people without the gene have symmetrical brains. NPR's Richard Knox reports.