Microbial Tracking-2 (MT-2): Today a crewmember collected saliva and body surface samples for the Microbial Tracking-2 investigation and placed them inside a Minus Eighty Degree Celsius Laboratory Freezer for ISS (MELFI). MT-2 monitors the different types of microbes that are present on ISS over a 1-year period. After the samples returned to Earth, a molecular …