Earlier this week, researchers in Japan made fertile mammalian sperm in a culture dish, a feat long thought to be impossible, Nature reports. Scientists apparently created sperm from the testicular tissue of mice and successfully produced a dozen adorable baby mice with it, mice who will never be emotionally troubled as a result of their origins. If the breakthrough technique transfers to humans successfully, scientists could help preserve the fertility of cancer patients and treat male reproductive problems. (And make test tube babies.) [Nature via Newser]
