Japanese Balloon Bomb

Is this scrap of fabric evidence of a secret wartime attack on the U.S. mainland? More

The granddaughter of a World War II veteran from Austin, TX may have remnants of a unique weapon in modern warfare: the Japanese Balloon Bomb. Host Tukufu Zuberi travels to Texas and to the Smithsonian's National Air and Space Museum in Washington, D.C. to learn whether this souvenir is a missing piece of a secret weapon.

AIR DATE 7/13/10