Not sure if this research passes the peer-review process. British psychologist Cliff Arnall claims that, according to a complicated equation he devised in 2005, the third Monday in January is the most depressing day of the year. He calls it Blue Monday. We’re so blue, Arnall says, because of the weather, the Christmas holidays being over, and already-failed New Year’s resolutions, among other things he takes into account. But Arnall’s formula was created as part of a publicity campaign for Sky Travel, a British TV channel that shut down in 2010. “The fact is that Cliff Arnall’s equations are stupid, and some fail even to make mathematical sense on their own terms,” psychiatrist Ben Goldacre wrote in his “Bad Science” column in The Guardian, and other scientists have dismissed the formula.