I have to mention "But How Do It Know?" here as well. I came across it from a previous HN discussion and picked up a copy. It's really, really good. And it's a

I have to mention "But How Do It Know?" here as well. I came across it from a previous HN discussion and picked up a copy. It's really, really good. And it's a really easy read. http://www.buthowdoitknow.com/ http://www.buthowdoitknow.com/