Harold, I've been a fan of critical thinking for years, since I was a grad student and TA'd for Jean Mandler's class on it. We used Diane Halpern's book as a text, and that approach is still relevant.

I think we need to do more, however. Just having the tools isn't enough. To develop new skills, we need support: motivation, examples, guided practice. The received wisdom is that it has to be layered on to authentic tasks. Of course, I say build it into a game! (there's a bit in Quest).

I sympathize with Charlene's cynicism, but I believe it can be taught, and there's evidence to support my position. But we do it by making it a priority (before college), and making it part of what we test (meaning a whole new type of testing, but that's what we need anyway).