Well, I can tell you that I would only like to be censored from child porn only because I have this overwhelming fear that should I happen to perchance upon it somehow, I don't want the FBI breaking down my door - other than that I know it exists and don't seek it out, which should be good enough. So far as children having access to scientific materials, I had such access and was raised to be smart enough to understand consequences to actions. I don't know how you've raised your children, and yes perhaps even if you did everything right they still might run out into traffic or swallow bleach or something, but really what can you do about that in grand scheme of things? Sure, once I was involved in the explosive destruction of an old TV set in a remote location with some homemade bombs that someone made from some bullets he managed to get his hands on (no scientific knowledge necessary!) but we still understood proper handling and nobody got hurt. It's the lack of knowledge that hurts people, not the presence of it!