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The Secret Life of Roots Plant roots are important to life on earth. Roots take in water and nutrients that the plant needs to live and grow. They also help secure plants in dirt to prevent erosion - the breakdown of soil by natural forces. Roots are
JUDY WOODRUFF: There was fresh evidence today of just how expensive college has become and how fast student debt is piling up. It came in the latest look at the bill that comes due once diplomas are handed out. The numbers are more daunting than ever
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