I think that the volunteers are just tough, and have adapted to and survived whatever conditions would have killed off the others. So they have superior genes.LOL
215 posted on 05/05/2014 7:59:58 PM PDT by greeneyes
(Moderation in defense of your country is NO virtue. Let Freedom Ring.)
217 posted on 05/05/2014 9:02:42 PM PDT by tubebender
(Evening news is where they begin with "Good Evening," and then proceed to tell you why it isn't.)