Facebook CEO Mark Zuckerberg, left,with his wife, Priscilla Chan, rehearse for a speech in San Francisco on Tuesday, Sept. 20, 2016. Zuckerberg and Chan have a new lofty goal: to cure, manage or eradicate all disease by the end of this century. To this end, the Chan Zuckerberg Initiative, the couple's philanthropic organization, is committing $3 billion over the next decade to help accelerate basic science research. (Jeff Chiu/THE ASSOCIATED PRESS)