Okay, this one’s really quite extraordinary.
Several years ago, world health practicioners observed that men who resided in African communities in which circumcision is commonly practiced had dramatically lower rates of HIV infection.
Preliminary research studies were conducted in South Africa and India that appeared to support the correlation, but scientists reserved judgement until the results of two much larger studies were in.
Their findings? That circumcision reduces the rate of HIV infection in heterosexual men by half.
You can read more about the studies on the BBC website, and in today’s New York Times. When you do, be sure to note the surname of the WHO director quoted therein.