A familiar face takes over the top spot on Forbes' list of the world's richest billionaires.
6. Charles Koch (tie) -- Along with brother David, Charles is co-owner and executive vice president of Koch Industries, the second-largest privately held company in the U.S. He's worth an estimated $40 billion.
Russian Federal Space Agency
John Stillwell/Royal Family
iStock / rojoimages
From Family Photos/CNN
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