Yeah, I always wondered about that... sure, it sounds good: try hard, and you can accomplish anything!

But independent of whether it's even true or not, how could anyone actually know it's true? Who volunteered to have 90% of their brain scooped out to see if it made any difference?

(I can see it now: "No, Mr Smith, you were always a complete moron - that's why you let us scoop out 90% of your brain")