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DNA degrades into shorter fragments over time making sequencing the more than 1 million-year-old teeth a bit of a puzzle, but permafrost helps preserve the genetic data, Nature reported. a959b upgrade nbsp;"I know this has presented a dilemma for President Biden because in this case, the science is at odds with a key group of his supporters, which are the teacher unions," Cornyn said. a959b upgrade Photo by CBS via Getty Images)Leachman first achieved widespread success and fame when she appeared on "The Mary Tyler Moore Show" as the self-centered landlady to Moore's Mary Richards. a959b upgrade Photo by Focus on Sport/Getty Images)Green Bay Packers running back Elijah Pitts is among those who rushed for two touchdowns in a Super Bowl and he completed the feat in the first game. a959b upgrade