A WikiHow article on How to Detect Lies.
My problem with the article? I do almost all of these, all the time. It’s called being nervous. For instance, #5 points out which direction a person is likely to look if they are telling the truth. I don’t care which direction I’m looking, I’m just looking away so I won’t think the person is staring at me. :)
Link courtesy of Lifehacker. Great blog, by the way.