A giant of world history

In a comment to my post entitled What You Can Look Like at 41, Phil Paine seconds my remarks on the historical significance of public health measures and says:

People like Dr. John Snow, who discovered the link between water delivery systems and cholera, and who fought heroicly against established powers to institute the necessary legal and technological solutions, will someday be regarded as the true giants of history.

A quick look at the web revealed that there is a very large and substantial site on John Snow. From the Urk! department I note that I am already quite a bit older than he was when he died.