Ive known of this technique since college, ~10 years or so now, and have always been interested in it, but have never fully committed to learning or mastering i

Ive known of this technique since college, ~10 years or so now, and have always been interested in it, but have never fully committed to learning or mastering it. My memory is usually pretty good, almost photographic often times (though if so its certainly limited). That coupled with Google, I think, has made me think it not worth the effort, but I may need to rethink that.