Facebook CEO Mark Zuckerberg, and his wife, Priscilla Chan, rehearse for a speech in San Francisco, Sept. 20, 2016. Zuckerberg and Chan have a new lofty goal: to cure, manage or eradicate all disease by the end of this century. They are committing $3 billion over the next 10 years to accelerate basic scientific research. (Photo/Agencies)
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