Self-Tracking

Gary Wolf has a fascinating and really well written article in the Times Magazine on the rise of the "quantified self," or all those people who rely on microsensors to measure discrete aspects of their lives, from walking speed to emotional mood:

Millions of us track ourselves all the time. We step on a scale and record our weight. We balance a checkbook. We count calories. But when the familiar pen-and-paper methods of self-analysis are enhanced by sensors that monitor our behavior...