How come in that episode with the black kryptonite where lex were split into two different personalites (yin and yang), how come Alex (evil) knew Clark was sick in the lab when it was actually Lex (good) with him? THen at the end, Clark asked LEx "do you remember anything that happened?" and Lex said no. Lex should have remembered that Clark has superhuman powers. Alex did, so Lex should have remembered that.