I have started writing Book three in the 'From Earth to Terra' series. My plot includes a bomb on one of the ships. So I turned to the web and searched exotic explosives. I found one that is theoretical right now. Packs quite a wallop from what I understand, in theroy, it can't be synthesized yet. It's called Octaazacubane.
I was telling my husband about it and his reply was, "are we going to have the FBI breaking down our door?"
Hmmm could be....