NOVA takes an in-depth, heart-stopping look at the ultimate chemical reaction - the explosion. Using high speed photography and dramatic reconstructions, this episode charts the tarnished history of explosives: the scientific ingenuity, the terrible accidents, and ultimately, the carnage of war and terrorism.

Tuesday, 7/3/07 from 8-9 p.m. and 1:30-2:30 a.m. ET
Friday, 7/6/07 from 4:30-5:30 a.m. ET