This has happened a lot of times and I was wondering if it happened only to me : I start typing on the forums a homework problem that I am not able to solve and then when I start typing it out, I suddenly can connect the dots or see an obvious error that I didn't see before. And then *snap snap* the problem is solved. Happens so many times. I'd have spent hours on paper and to no avail. And then when I type it out here to explain to the reader what I have done and how I got there, I'm done. I can't do the same thing when I try it without the computer.