The weightless microgravity environment of space can alter disease-causing bacteria as they grow--and that's not necessarily a bad thing, CNN reports. Scientists hope understanding these changes can provide an opportunity for vaccine development. "Vaccines are about identifying targets, and in microgravity, the bacteria have unmasked themselves and revealed secrets to help develop therapeutics," Cheryl Nickerson, part of a team from Arizona State University that collaborates with NASA, told the news outlet. More