One of the most memorable passages from Cliff Stoll’s “Silicon Snake Oil” was about the reliability of snail mail. How you could scribble a person’s name on a p

One of the most memorable passages from Cliff Stoll’s “Silicon Snake Oil” was about the reliability of snail mail. How you could scribble a person’s name on a postcard, mess up a lot of details, and it still manages to get to them.