Microsoft founder Bill Gates, his wife Melinda French Gates and British Prime Minister David Cameron at the World Economic Forum on January 28, 2011, in Davos, Switzerland. Johannes Eisele/AFP/Getty Images hide caption

toggle caption Johannes Eisele/AFP/Getty Images

Bacon is cut from the pig's belly, and is one- to two-thirds fat. Justin Sullivan/Getty Images hide caption

toggle caption Justin Sullivan/Getty Images

A traveler passes an automated external defibrillator at O'Hare International Airport in Chicago. Tim Boyle/Getty Images hide caption

toggle caption Tim Boyle/Getty Images