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Much the same could be said of memory. We know a good deal about how memories are assembled and how and where they are stored, but not why we keep some and not others. It clearly has little to do with actual value or utility. I can remember the entire starting lineup of the 1964 St. Louis Cardinals baseball team—something that has been of no importance to me since 1964 and wasn’t actually very useful then—and yet I cannot recollect the number of my own cell phone, or where I parked my car in any large parking lot, or what was the third of three things my wife told me to get at the supermarket, or any of a great many other things that are unquestionably more urgent and necessary than remembering the starting players for the 1964 Cardinals (who were, incidentally, Tim McCarver, Bill White, Julian Javier, Dick Groat, Ken Boyer, Lou Brock, Curt Flood, and Mike Shannon). So there is a huge amount we have left to learn and many things we may never learn.
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