The University of Texas MD Anderson Cancer Center was the first hospital to give the Xenex robot (as called by Stibich) a go, and figured out that it actually reduced overall bacterial contamination by a factor of 20 and killed 95% of the deadly pathogen C. difficile. Cooley Dickinson Hospital in Northampton, Mass., relies on a trio of rented Xenex robots, and have since seen C. diff infections drop by a stunning 53%. Each of these bad boys will cost a rather hefty $125,000 if you want to purchase them outright, or you can rent them for $3,700 each month.