Time Magazine's annual list of the World's Most Influential People runs the gamut, honoring men and women in the following categories: artists and entertainers, scientists and thinkers, leaders and revolutionaries, heroes and icons, and builders and titans. The 2012 list includes Chancellor of Germany Angela Merkel, U.S. Secretary of State Hillary Clinton, British pop singer Adele and billionaire Warren Buffett, among others. See who was chosen, and who was overlooked.