I was biasing the results by using full-text search to explore my email. I would look for the things I found interesting that day—searching on terms like “Google” or “literature” or “e-reader”—and see a chronological list of exactly what I said about those very terms. The pattern-seeking engine in my brain would fire on all cylinders and make a story of the searches, creating an unintentional email-chrestomathy, a greatest-hits collection of ideas I’d had around a single word or phrase. The results seemed weirdly definitive. I thought I was doing history in a mirror, but because the emails were pure matches for key terms, devoid of all but a little context, I fell for the historical fallacy
http://www.ftrain.com/times-inverted-index.html