Forbes announces 2015 list of world's richest people

<div class="meta image-caption"><div class="origin-logo origin-image ap"><span>AP</span></div><span class="caption-text">20. Sergey Brin (United States) Net Worth: $29.8 billion Source of Wealth: Google</span></div>
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.