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  • Forbes' Richest Americans

    Microsoft co-founder Bill Gates reclaimed the title of world's richest person. He is the richest person in the U.S. for the 20th year in a row, according to <a href=""target="external">Forbes</a>. Worth an estimated $72 billion, Gates, co-chair of the Bill and Melinda Gates Foundation, beat Carlos Slim, chairman of Grupo Carso in Mexico, for the world title.
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  • Forbes' Richest Americans

    Berkshire Hathaway CEO Warren Buffett is the second richest person in the 2013 Forbes 400 list as the biggest dollar gainer this year, after adding $12.5 billion to his net worth. He is now worth an estimated $58.5 billion.
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  • Forbes' Richest Americans

    Oracle Corp. CEO Larry Ellison is worth an estimated $41 billion, making him the third wealthiest person in America, Forbes says.
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  • Forbes' Richest Americans

    Charles Koch, 77, chairman and CEO of Koch Industries, and the fourth richest person in the country, tied with his younger brother, David Koch.
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  • Forbes' Richest Americans

    David Koch, executive vice president of Koch Industries Inc., 73, tied with his brother Charles for an estimated net worth of $36 billion.
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  • Forbes' Richest Americans

    Producer Christy Walton, 58, is the wealthiest woman in the world, according to Forbes, and the sixth richest person in the country. She is worth an estimated $34.5 billion. Walton inherited wealth after her husband John Walton, died in an airplane crash in 2005. Her father-in-law was Sam Walton, founder of Wal-Mart.
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  • Forbes' Richest Americans

    Jim Walton, chairman and chief executive officer of Arvest Bank Group Inc., is the youngest son of Wal-Mart founder Sam Walton. Walton, 65, is worth an estimated $33.8 billion, according to Forbes.
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PHOTO: A home damaged by a landslide Friday, April 18, 2014 in Jackson, Wyo. is shown in this aerial image provided by Tributary Environmental.
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PHOTO: Woman who received lab-grown vagina says she now has normal life.
Metropolitan Autonomous University and Wake Forest Institute for Regenerative Medicine