Bill Gates: William Henry Gates III (1955-), along with Paul Allen, co-founded Microsoft Corporation, the world's largest software maker. Bill Gates, the wealthiest person in the world with an estimated net worth of $480 crores (Rs 211,200 crore!), is probably the best-known college dropout. Gates attended an exclusive prep school in Seattle, went on to study at Harvard University, then dropped out to pursue software development. As students in the mid-70s, he and Paul Allen wrote the original Altair BASIC interpreter for the Altair 8800, the first commercially successful PC. In 1975, Micro-Soft - later Microsoft Corporation - was born. Three decades on, Gates has been Number One on the Forbes 400 for over a dozen years. And here's something you probably didn't know: The Bill & Melinda Gates Foundation currently provides 90 per cent of the world budget for the attempted eradication of polio.