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      8/22: Autism risk could rise with father's age; Curiosity takes first test drive on Mars

      |A new study by scientists in Iceland says the age of the father at the time of conception - not the age of the mother - can raise the risk of autism in a child. Jim Axelrod reports; And, sixteen days after landing on the red planet, NASA took the Curiosity rover out for a spin for the first time. Ben Tracy reports.

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