Forbes announces 2015 list of world's richest people
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20. Sergey Brin (United States) Net Worth: $29.8 billion Source of Wealth: Google
Microsoft founder Bill Gates has once again been named the wealthiest person in the world, a title he's held for 16 of the past 21 years. Check out who else made Forbes' 2015 list of the world's richest people.
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