I've always liked the post provided by BetterExplained[0], but this article is more thorough while remaining simple. Would probably still use the BetterExplaine

I've always liked the post provided by BetterExplained[0], but this article is more thorough while remaining simple. Would probably still use the BetterExplained post for a first introduction, I think. [0]:http://betterexplained.com/articles/understanding-quakes-fast-inverse-square-root/ http://betterexplained.com/articles/understanding-quakes-fas...