Most of the stuff I've learned that has actually stayed in my head is stuff I've learned for myself. If you think you've tried and failed with me, have another go. Try to not give up explaining half way through. Get me going and I'll grab the rest. I think the problem we have here is your apparent inability to articulate your ideas clearly. By all means carry on insinuating that I'm too thick to get it. My head may be thick but my hide is even thicker.