Hi, my name is Alex. I'm not that smart as ppl posting articles here. My ability to properly challenge the captcha only from 2nd attempt while registering here in LW proves this :) So I was learning math when being student, now working in IT. While typing this comment I've been thinking what is my purpose of spending time here and reading different info... and suddenly realized that i'm 29 already and life is too short to afford thinking wrong and thinking slow. So hope to improve myself to be able learn and understand more and more things. Cheers to everyone :)