I'm running a little early for my trip to the Red Cross, so here's an article and my two cents. I think that we all know the negative Nancies of the world, but the NYT throws in that journalistic ambiguous pronoun of 'some:' "Some people do have a more positive outlook, but almost everyone
remembers negative things more strongly and in more detail." Either way, apparently, it is all psychological and physiological that you can only remember the glass being half empty, apparently. After all, there's a reason that Fail became an internet meme, but not Success.