Today in Heritage History, 1807, a gunpowder ship explodes in Leiden, Netherlands. One hundred and fifty Dutch died. Survivors reported that the last they remembered before the explosion was a conversation in the cargo hold of the ship (where the gunpowder was being stored), between Dieter Hoosvenhort the ship’s cargo master, and Gustaf Kaiserhooven, the ships maintenance man. Survivors weren’t sure who said what to whom, but clearly remembered someone say, “Hey, watch what I can do with this helium balloon after I rub it on my head”.