Your memory serves you well....

1-3 are conductive.
5-8 are non-conductive.
And materials with 4 are semi-conductive when doped with impurities, can go either way with a potential.

I'll bet that much of nervous, and other tissues stand in the realm of 4??????

Life as a giant SCR......


Mark Heller
"Well - I oughta....." -Jackie Gleason