Why, oh why, do we forget so many of the books we've read? And the movies we've seen? And the television shows? And if we brushed our teeth or where we put the keys or--um, I was going to say something else here, but I forgot what it was. Julie Beck of The Atlantic looked into that for us and can explain here why we forget books (and everything else) and if anything can be done about it, other than always putting your keys in the same place.