Just before the section on Moore's Law, it says this about silicon purity: > Electronic grade silicon (EG-Si): 99.9999999 pure ('nine nines pure') Thats one im

Just before the section on Moore's Law, it says this about silicon purity: > Electronic grade silicon (EG-Si): 99.9999999 pure ('nine nines pure') Thats one impurity atom in every 10.000.000 silicon atoms. I believe that should be 1.000.000.000 (10^9 atoms) to correspond to nine nines pure. Just as one impurity atom in every 100 (10^2) atoms would be 99% (two nines) pure.