OK, was this a play on words or did the show get it wrong? I didnt record it so I am not 100% sure. Was his loosing question, what is the most abundant Mineral in the human body? Or did they say mineral? I would think that if they asked metal, and they said the answer was calcium, then they would be wrong. Wouldnt they? Calcium is a mineral, not a metal? Jack would have gotten it wrong anyhow, but darnitallanyway that is buggin me to no end! LOL