Studies that were often double-blind and placebo-controlled.

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The idea of blind obedience isn't as important in these studies as the larger message about the power of the situation, Burger said.

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Susan Goldin-Meadow, author of Hearing Gesture: How Our Hands Help Us Think, points out clinical studies that reveal that even deaf and blind infants gesture when they are making sounds.

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Studies show that about 70 percent of people who are blind are unemployed or underemployed.

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