SAN FRANCISCO - JUNE 01: A woman performs chest compressions on a mannequin while learning C.P.R. on the steps of San Francisco city hall following a press conference celebrating the 50th anniversary of lifesaving by using C.P.R. June 1, 2010 in San Francisco, California. Dozens of people stopped for free C.P.R. lessons given by volunteers from the San Francisco Paramedic Association. C.P.R. (cardiopulmonary resuscitation) is a combination of rescue breathing and chest compressions delivered to aid victims who are in cardiac arrest by keeping oxegenated blood flowing to vital organs. (Photo by Justin Sullivan/Getty Images)
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Getty Images News Justin Sullivan