The twenty-five richest people in America have a minimum net worth of $12 billion each.  Bill Gates, Microsoft founder and all around uber-genius tops the list with $57 billion.  Warren Buffett comes in a relatively close second at $50 billion.  Then there follows a significant drop off both in terms of dollars and name recognition. The money is staying in the family, with a number of second generation billionaires on the list.  Four of the top six are members of the Walton family (the Wal-Mart Waltons, that is).  The Koch brothers, of whom you've probably never heard, are tied for ninth...

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