Later down: > In fact, HeH+ is the strongest known acid, with a proton affinity of 177.8 kJ/mol, or a pKa of −63 Long time I didn't do chemistry but that pKa

Later down: > In fact, HeH+ is the strongest known acid, with a proton affinity of 177.8 kJ/mol, or a pKa of −63 Long time I didn't do chemistry but that pKa made me jump off of my chair. For comparison hydrochloric acid is ~10. Since it's a charged molecule one could maybe contain it in an EM field to have some ready-to-use "eat anything" material. Almost - but not quite - as scary as FOOF: > Dioxygen difluoride reacts vigorously with nearly every chemical it encounters (including ordinary ice) leading to its onomatopoeic nickname FOOF (a play on its chemical structure and its explosive tendencies) "vigorously" being quite an understatement.