"Yeah, ten billion points to you. Not alone, of course, but calcium carbonate can be used as a compound to cause the chemical reactions to create potassium nitrate, which is one of the three main ingredients in gunpowder."

He said with an amused smile. The truth was, despite the fact he wasn't going to point out things without being prompted - knowledge was meant to be shared. It was what people did with that knowledge that came afterwards.

"As it always seems to be, nitric acid is not just readily available, so I wasn't intending on making any."