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by Gina Trapani Click to view I have a terrible memory, especially when it comes to when things happened. Significant life events - like graduating and 9/11 - are all landmarks that help me remember when events occurred relative to them (i.e., "that was before I moved to California.") But there are still long periods of my past that are just a big amorphous blur - especially before I started using a computer every day. As a result, I've always been fascinated with digital timelines as a memory aid and reference: the ones that occur as artifacts of other activities (like our sent email folder and digital photo collection), and the ones we can purposefully construct for historical documentation.