You know quicksilver. Chances are you've even seen it before. Possibly in some movie featuring killer robots or something. It's one of those things that a lot of geeks form a variety of fandoms have come across at some point. Most people call it mercury though. Still, what is it, and what does it have to do with brimstone and the composition of the human body? We'll take you on a grand tour of history, chemistry, and even our old friend alchemy to find out. You can support us on Patreon.