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** FILE ** This mouse was produced from stem cells coaxed from skin tissue of adult mice and then reprogrammed. Two teams of Chinese scientists have made a major advance in the development of a new kind of stem cell that doesn't involve destroying embryos. (AP Photo/Nature, Dr. Qi Zhou)
Photo by: Dr. Qi Zhou
** FILE ** This mouse was produced from stem cells coaxed from skin tissue of adult mice and then reprogrammed. Two teams of Chinese scientists have made a major advance in the development of a new kind of stem cell that doesn't involve destroying embryos. (AP Photo/Nature, Dr. Qi Zhou)

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Best combat rifles of all time

A combat rifle is a military service rifle that fires a full-power rifle cartridge, a mainstay of every modern army in the world. See the best combat rifles ever made.