1) Explosive chemical 
Benzvalene is an organic compound and one of several isomers of benzene. It was synthesised in 1971 by Thomas J. Katz et al. The 1971 synthesis consisted of treating cyclopentadiene with methyllithium in dimethyl ether and then with dichloromethane and methyllithium in diethyl ether at -45°C. The hydrocarbon in solution was described as having an...