>> as a pes mkhitaryan, you would think so. fatty acids in fish have been linked to higher intelligence and improved sleep, but this new study at the university of pennsylvania is one to study all three factors. i do not sleep more and i am definitely not bright. >> disproved. moving on. >>> apparently, you're never too old to kick up your heels for the holidays. >> seniors in milwaukee decided to put on their own christmas spectacular. the women of a certain age formed their own version rockettes. >> staffers got into the act i go raidieading letters to santa. ♪ i like to move it, move it >> you like to. ♪ move it >> do, do, do, do. >> they've got it. >>> coming up, the story behind the story. kevin spacey's replacement in a new movie, christopher plumbmer talks about what it was like to reshoot the scenes. >>> and the kidnapped baby and what police are revealing about the alleged kidnapper. now a look at today's temperatures. >>> "world news now" weather, brought to you by dawn. happy anniversary dinnedarlin' i'm me