[sk2code]

Thanks for sharing this. Every single day I convince myself that I am not wasting my time by going on HN and posts like these are the reason I find something useful and meaningful. This is something I can share with my 9 year old son who is showing keen interest in Maths. Though the stuff presented here is still pretty advanced for him to grasp, but sharing this will help him immensely to keep pursuing his mathematical interest.

Batman Graph rocks !!