The bit about Feynman watching the nuke test was from his book, "Surely You're Joking, Mr. Feynman"
Regarding tempered glass, How difficult is it for a mortal to cut tempered glass?
I recall my dad having a sheet of tempered glass which he had scored with a glass cutter but was still
unable break. As far as I know, that sheet of glass is still sitting around, somewhere, with that score line.