contamination

NASA works to prevent contamination of solar system

(CNN) - NASA is working on a plan that when astronauts step on the moon and Mars in the future, they leave only footprints. The space agency is revamping planetary protection guidelines to make sure we don't contaminate the…

Early CDC Test Kits Delayed Due To Contamination

(CNN) - An investigation indicates early Centers for Disease Control and Prevention coronavirus tests were probably contaminated. The Department of Health and Human Services reviewed the problems with them. A spokesperson says one of the reagents was likely the…