Via Freakonomics, this post is straight out of the A.J. Jacobs' life-as-experiment school of thinking. While there is plenty of research demonstrating that from moment to moment we're not nearly as transparent to ourselves as we'd like to believe, The Quantified Self takes that essential thought and thoroughly geeks out, providing "tools for knowing mind and body." With the application of some scientific method, keen observation and ample disk space I might acquire some belated insight.
I dunno. As a firm advocate for the qualified life, my life hacks will be limited to a few crunches - or not - and a walk with the dog. There are some things I just don't want to know about.
Bonus link: Self-knowledge