It's official: Data science proves Mondays are the worst

People who are miserable on Monday have lots of company. It's the worst day of the week for millions, according to researchers at the University of Vermont Complex Systems Center who analyze Twitter messages for happiness sentiment. Mood tends to improve during the rest of the week, peaking on Saturday, before beginning to crash again, according to data based tweets since 2008. Even cartoon cats know Monday sucks, but the sheer (and increasing) amount of data that's available every day, combined with improving techniques for analysis, could offer new insights into society. And while there are many instruments for measuring things like wealth and productivity, ideas like "happiness" for large populations have been more difficult to pin down.