Monday, January 23 gloomiest day of the year: academic Sun Jan 22, 4:07 PM ET LONDON (AFP) - Watch out: Monday, January 23 is going to be the unhappiest day of the year, according to a British university researcher. Cliff Arnall, a health psychologist at the University of Cardiff, specialising in confidence-building and stress management, told AFP the prediction was the result of some gruelling mathematics. Post-Christmas blues, the return to work after the holidays, mounting bills to pay for the parties, the challenge of keeping New Year's resolutions, the slender prospects of fun in the weeks ahead and chilly...