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When sealed flasks of Salmonella typhimurium bacteria were sent into space on the Shuttle Atlantis for 12 days in 2006, the microbes became 3 times more lethal than their earthbound counterparts. Researchers discovered this after feeding mice identical strains of the bacteria, varying only whether the Salmonella had traveled to space or remained in similar temperature conditions on earth. After just under a month, 90% of the mice that had been infected with the space germs were dead, as compared to only 60% of the Earth bacteria group. Not only did the space Salmonella kill more mice more quickly, it also showed different genetic activity than non-traveling bacteria.