Doesn't exist, but there are hundreds of terrorist out there who think it does! http://www.nytimes.com/2015/11/22/magazine/the-doomsday-scam.html?hp&action=click&pgtype=Homepage&clickSource=story-heading&module=b-lede-package-region®ion=top-news&WT.nav=top-news&_r=0 The stuff that they have come up with is pretty amazing on it's own. I for one will be immediately putting red mercury into my work, just to keep these people guessing.
This was really interesting. I had assumed that the film RED 2 had fabricated the item as a novelty for the story-line.
Loved this quote especially. I'm really considering tacking it up above my computer as inspiration: ‘‘Take a bogus material, give it an enigmatic name, exaggerate its physical properties and intended uses, mix in some human greed and intrigue, and voilà: one half-baked scam,’’ I mean, what a perfect encapsulation of the sci-fi writing process