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Tech billionaires are taking philanthropy to a new level. Manuela Saragosa speaks to David Callahan, philanthropy watcher and author of The Givers: Wealth, Power, and Philanthropy in a New Gilded Age. We also hear from Antonia Mitchell, director of Aurelia Philanthropy, who helps the super wealthy distribute their money, and James Chen, a Hong Kong philanthropist who explains why China is lagging behind in the global charity stakes. (Photo: Mark Zuckerberg and wife Priscilla Chan, Credit: Getty Images)