Billionaire <a gi-track='captionPersonalityLinkClicked' href=/galleries/search?phrase=Carlos+Slim&family=editorial&specificpeople=584959 ng-click='$event.stopPropagation()'>Carlos Slim</a> speaks at a news conference with Salman Khan, founder of Khan Academy, unseen, in Mexico City, Mexico, on Monday, Jan. 14, 2013. Slim announced his support for Khan's not-for-profit website that offers free educational videos and teaching tools. Photographer: Susana Gonzalez/Bloomberg via Getty Images