The 20 richest people on the planet

Forbes is out with its annual list of the wealthiest people on the planet.

Microsoft founder Bill Gates remained in the top spot for the second year in a row, having added $3.2 billion to his personal wealth.

Tech tycoons continued to dominate, with Larry Ellison, Mark Zuckerberg, Jeff Bezos, Larry Page, and Sergey Brin all appearing in the top 20. With the boom in Silicon Valley, Forbes notes that California is now home to 131 billionaires, "more than any other country besides China and the US."

You can see Forbes' complete billionaires list here; we're taking a closer look at the top 20.