The improvement of hospital facilities owe a great deal to humanity's ability to destroy germs at will when it is important to do so, e.g. during/after surgery.

The improvement of hospital facilities owe a great deal to humanity's ability to destroy germs at will when it is important to do so, e.g. during/after surgery. http://jfh.sagepub.com/content/14/3/195.abstract http://jfh.sagepub.com/content/14/3/195.abstract Hospitals were death traps 200 years ago.