Yep I mentioned that in a comment below, an accidental semiconductor IS possible, but that wasn't my point really. I get the arguers point though, a headboard i

Yep I mentioned that in a comment below, an accidental semiconductor IS possible, but that wasn't my point really. I get the arguers point though, a headboard implies accidental, I wasn't thinking of it that way. But anyway, as we've established, both improvised and accidental are possible and documented.