I find the concept of body language very interesting, but I'm wondering if it's worth learning.

  • Is it accurate and precise, or is there a high rate of false positive/negatives?
  • Ignorance is bliss and all. Could I psych myself out by knowing about it? EG: Her crossed arms mean she's defensive, I shouldn't bother asking for her number.
  • Is it difficult to learn and use?
  • What's a recommended resource to learn. Post/blog/book/video, whatever.
  • Wasn't body language info in the FAQ at some point? Was it removed for some reason?