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7) Elizabeth Holmes(7 of 10)
7) Elizabeth Holmes(7 of 10)
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Holmes, 30, is the richest self-made female billionaire thanks to Theranos, a blood testing company that she founded after she dropped out of the chemical engineering program at Stanford at age 19. This brainiac billionaire speaks fluent Chinese and holds more than 80 patents. She’s estimated to be worth about $4.5 billion.