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This Week in Science: Cloning Limits, Sperm in Space, And Much More!

This week in science: Japanese researchers find out just how many times you can clone a clone; CERN takes antimatter on a road trip for the first time; Australian scientists discover that sperm gets lost in space; and much more! 'Dead End': Radical 20-Year Study Reveals Genetic Cloning Hits a Limit [caption id="attachment_195930" align="alignnone" width="642"] (Peter Finch/Stone/Getty Images)[/caption] A 20-year mouse study has hit the limits of cloning.

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