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  • SSS 2009-07-10

    This is Scientific American's 60-Second Science, I'm Cynthia Graber. This will just take a minute. It sounds like the title to a Rudyard Kipling tale: how the turtle got its shell. But its actually a question that has puzzled scientists. After all, n...

  • 老友记 第四季 12 The One with the Embryos

    The One With The Embryos 本集简介: The guys' chicken is becoming a rooster. Phoebe undergoes the procedure to implant embryos in her uterus; the pressure is high as Frank Jr. and Alice can only afford the procedure once. Monica and Rachel bet th...

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