Despite the potentially huge customer base, e-commerce sites selling clothes for shorter men remain a rarity.
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"People took me aside and said, 'Don't do it. You're throwing away your career. You're making a terrible decision,'" Randi Zuckerberg says.
Taylor Rosenthal can't even legally drive but already has a plan to change the way people get first-aid supplies.
America's millionaires are more common than you think. Check to see how similar you are to them.