Carlos Slim Helu

Pop Quiz: Fun Facts About the World's Biggest Billionaires

As Forbes begins to release details about 2013's new billionaires, we decided to take a peek at the people who already dominate the list. Think you know the scoop on the super-rich? Take our quiz and find out.

Forbes: The Richest People in the World 2011

Carlos Slim Open to Energy Investments Outside Mexico

Forbes 400: The Richest People in America

Mukesh Ambani: The Next Richest Man in the World?

India's Mukesh Ambani may not be a household name like billionaires Bill Gates or Warren Buffett, but here's a look at why it could be just a matter of time before the Indian mogul climbs to the top of the world's richest list.