There’s a bunch of yada yada yada at the beginning of this video. Clicking the embedded player above should take you right to the pr0no for pyros at 1:28, and you can always rewind if you want to watch a professional synthesize a little bit of the highly unstable stuff and/or learn about its history. Video from the BBC, an online teaser for their documentary Explosions: How We Killed Countless Millions Shook the World.