Charlie Sheen, Angus T. Jones and Conchata Ferrell star in Two And A Half Men, which will cease production for the season because of Sheen's recent personal problems. Greg Gayne/CBS/AP hide caption

itoggle caption Greg Gayne/CBS/AP

IBM's Watson computer system competes in a Jeopardy! practice round on Jan. 13 against two of the show's most celebrated contestants: Ken Jennings and Brad Rutter. IBM hide caption

itoggle caption IBM