What a wonderful write-up, merging theories of Maths with social behaviors and explaining the concept of the small world through crystal clear illustrations. This article gave me so many thoughts to ponder on! Sorry to hear that you're battling with depression and I wish that you get out of this cycle of depression as soon as possible.I wonder how do you manage to bring about so many interesting topics to write on, regularly, in spite of battling with depression! There's a lot to learn from your spirit! Keep going.