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 A 20-year mouse study has hit the limits of cloning. Genetic mutations built up after 25 generations, with 58th-gen mice unviable. "Although serial cloning could not continue beyond the 58th