Article Photos: Meredith Vieira to sub for Bob Costas on NBC 1/1

FILE - This Jan. 12, 2012 file photo, Meredith Vieira attends the "Today" show 60th anniversary celebration at the Edison Ballroom in New York. Vieira will cover for Bob Costas on NBC’s Olympics broadcast on Friday because of an eye infection. (AP Photo/Evan Agostini, File)