How "Duck Tails" Can Help Authenticate Antiques

The sisters dig through Mary's home for possible hidden treasures to sell, Antiques Roadshow style. Terry examines an ecletic piece of wood furniture which she believes could be valuable. Her key observation? The fact that it has "duck tails." Yes, it's just one of those "you have to see it to understand it" things! Plus, Mary adds some Norman Rockwell paintings to the pile...but are they real?