No reason given; his wife's in a separate facility
                                
                                
                                    (Newser) -
                                    Charlie Sheen is checking himself into rehab as a "preventative measure," says a spokesman, without specifying the reason why. He's taken a hiatus from shooting Two and a Half Men and will be in rehab for two weeks, reports  TMZ . Sheen's wife, Brooke Mueller, also is in rehab,...