I solemnly swear I am up to no acts of domestic terorism

[blamebrampton]

But I do need to know a bit about using C-4 explosives. For a story I am working on. Just basic things, such as the amount you would need to blow a hole in a wall without blowing up everything in the room the wall was part of. And what density of object you would need to hid behind were you in said room.

Normally I'd turn to my Googlefu, but I have a cat in one hand and a reasonable suspicion that Echelon tracks me already thanks to my many Bush jokes and botanical poisons expertise ...

Anyone?