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The founder of Tesla Motors is among the new signatories who have promised to give away half of their wealth.
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Biographer Walter Isaacson draws on more than 40 interviews with the late Apple co-founder in his new book, Steve Jobs. Isaacson describes how Jobs grappled with being adopted, how he became a notoriously demanding boss, and how he fought the cancer that eventually killed him.
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Philanthropist Bill Gates says the time is now for the world to redouble efforts to eliminate polio by funding efforts to vaccinate vulnerable people against the disease. An international initiative to wipe out the disease faces a $720 million budget shortfall.