Bill Gates is richest man in the world. The ranks of the world's billionaires continue to scale new heights, according to the US Forbes magazine. The magazine found 1,645 billionaires, a 15.3% increase on last year's figures and a record since the Richest People On The Planet survey began in 1987. Together, they account for an aggregate net worth of $6.4 trillion, up from $5.4 trillion a year ago. The US once again leads the world with 492 billionaires on its territory, followed by China...