Lionel, I'm sure, knows everything--he has to by now!! His every indication is that he knows just about all there is to know.

mmm...I thozght while watching this one scene, that Helen gave the letter to Lionel and not the other way around. Maybe it was the key to this one room...
I just cannot imagine her sharing it. I always thought she wanted to make her name on a huge scientific find.
Well..we'll see. Maybe she really was bribed. Dunno what her motivation is... and when this Lionel thing happened..since there was a confrontation with him two eps before. I wonder why Lionel lost control like that to Pete too...

Thought Pa Kent's reaction was a little harsh--emotionally understandable, but I don't think Clark or anyone could've foreseen the consequences, because it was, like much in Smallville, a freak accident.

I only agree partly. Yes, his reaction was harsh, however Clark knows deep down that Bo doesn't mean it like that and he's not helping them, he's running away. Taking Red Kryptonite prooves that to me. Ok, maybe he really beleives that he causes harm. maybe not...

I have another theory added...maybe it's farfetched!