"Mirror Worlds" is only one of David Gelernter’s big ideas. Another is “lifestreams”—in essence, vast electronic diaries. “Every document you create and every document other people send you is stored in your lifestream,” he wrote in the mid-1990s together with Eric Freeman, who produced a doctoral thesis on the topic. Putting electronic documents in chronological order, they said, would make it easier for people to manage all their digital output and experiences. The latest trend is “life-tracking”. Practitioners keep meticulous digital records of things they do. The first self-trackers were mostly über-geeks fascinated by numbers. But the more recent converts simply want to learn more about themselves, says Gary Wolf, a technology writer and co-founder of a blog called “The Quantified Self”. They want to use technology to help them identify factors that make them depressed, keep them from sleeping or affect their cognitive performance. One self-tracker learned, for instance, that eating a lot of butter allowed him to solve arithmetic problems faster.
Read more at The Economist.
