yet antb has hydrogen... hes pushing the hydrogen, antimatter,emitter, single use wire, fireworks, h2o2, red brick, mutagenic neutrons and photons... simon prob wont take tho.
I have a great idea ( Well for me it is ) : Rust! RUST, appear when there's a too long contact of Distilled water ( Why distilled water? Cause some peoples won't be happy if it react with everykind of water) Or Oxygen ( And liquid oxygen). The uses? Mixed with broken metal, it makes thermite! And when it has burned, only the broken metal would left ( Well if it could cool down in a metal wire, it would be even better....).