Microsoft founder Bill Gates has recovered his spot at the top of the US money heap, taking the place of investor Warren Buffett as America's richest person, Forbes magazine's latest list reveals.  With 57 billion dollars net worth Gates again leads the list of 400 richest individuals in the world's wealthiest country. He displaced Buffett who briefly held the position this year but who has seen his Berkshire Hathaway investment group's shares slip 15 percent since February and is now worth 50 billion. According to Forbes, whose list was published late Wednesday, the golden 400 have 1.3 billion dollars net worth or more. However, their combined net worth rose only 30 billion dollars, or two percent, to 1.57 trillion dollars. Forbes said that rising oil and dizzy art prices fuelled the entry of 31 new members into the ultra-rich club and the return of eight previous members. A notable arrival was Mark Zuckerberg, 24, founder of the social networking site Facebook（脸谱网）. Forbes estimates his worth at 1.5 billion dollars. Meanwhile, turmoil（动荡）on the stock and housing markets saw 33 others drop off the list, including the former head of the troubled insurance giant AIG, Maurice Greenberg, and a former head of the online auction site eBay, Margaret Whitman. Biggest gainers were led by New York Mayor Michael Bloomberg who took eighth place with 20 billion dollars worth after a transaction（交易）put a new value on his Bloomberg media and financial data network. The biggest loser was casino（赌场，娱乐场）tycoon Sheldon Adelson, whose fortune fell 13 billion dollars over 12 months -- the equivalent to 1.5 million dollars an hour -- although he still has 15 billion dollars and occupies 15th place. About two thirds of the list are self-made billionaires and just over 10 percent are women, led by television star Oprah Winfrey whose fortune rose 200 million dollars to 2.7 billion dollars. 小题1: According to Forbes, Warren Buffet is worth _____.
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