Of the more than 7,000 stories submitted so far to the Baseball Memory Lab, a joint effort of the Major League Baseball Origins Committee and MLB Advanced Media, there is one by a longtime Red Sox fan named Sheldon Siegel that begins with a most appropriate word: “Unforgettable.” Indeed, his word is the very reason for BaseballMemoryLab.com, a repository of those stories that are unforgettable to each individual and worth preserving for future generations.