The National Zoo is preparing for a pretty big reveal Friday. Video above: Pandas play in the snow at Smithsonian's National ZooThe zoo's two pandas, Bao Li and Ching Bao, will make their public debut, and the Giant Panda Cam will go live!Anyone planning to visit the zoo in D.C., will need to keep the following information in mind: Admission to the National Zoo is free; however, visitors will need a timed pass to enter. Children and babies will also need a pass.Passes can be reserved ahead of time on the zoo's website. The zoo is open seven days a week from 8 a.m. until 4 p.m.; the last entry into the zoo is 3 p.m.