On 2/24/2012 6:08, Richard wrote:
Like most of us (baby boomers) I grew up in a world that already had
nuclear weapons. We did "Duck and Cover" drills in school, and I
thought I had a fair notion about how these things worked.

A nice technical document:
http://nuclearweaponarchive.org/Nwfa...1.html#Nfaq4.1