vb:literal>
"Courage is not the absence of fear, but the realization that there is something more important than fear."
"Death is only one of many ways to die."
I remember finding some that were stored in my father's closet that had failed, but anything is possible. So, I did some extensive research (Ok, I just googled and read the summaries of the first page), and "Six year shelf life" was mentioned. So, they can apparently fail in time, and one could assume that extreme heat, cold, or other factors could affect that predicted shelf life.
Now, if you put two sets of hand warmers into an ammo box, and activate one of them, maybe the activated ones would keep the unactivated ones warm enough to maintain that shelf life during the Winter.
DNFTT! DNFTT! DNFTT!
"The funniest thing about this particular signature is that by the time you realize it doesn't say anything it's to late to stop reading it..."
and a rusty lug wrench!