formation.</p>
<p>Why was my second sprint at genealogy so much more productive than my first? Of course, part of the reason was the digitization revolution, which meant that there were more historic documents available instantly to me electronically than was the case a decade before. But the biggest reason why I could make so much more rapid progress was because I was no longer doing this alone. I was, in fact, part of a huge open network graph created by millions of family history researchers. When that h