"We can see evidence of what happened to her during life, " says paleontologist Bill Simpson.

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Perry served as Bill Clinton's secretary of defense and Republican Simpson served in the Senate from 1979 to 1997.

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There are enough Senate Democrats who support the Simpson Bowles proposals to pass such a bill through the Democrat controlled Senate.

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The proposal from former Republican Senator Alan Simpson and Democrat Erskine Bowles, President Bill Clinton's former chief of staff, suggests taking about a quarter of savings from changes to healthcare programmes and another quarter from new revenue from tax changes.

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Simpson and Erskine Bowles, a former White House aide to Bill Clinton.

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