Source: Photo/Salena ZitoWALL, South Dakota -- Everything about Wall Drug, arguably the most iconic and long-lasting drugstore in America, exemplifies a doggedness. It took persistence to not only survive, but also thrive against insurmountable odds in a place few thought a small business had any business starting an enterprise in the first place. In 1931, when Ted Hustead and his wife Dorothy were looking for a place to open a drugstore, he picked the thinly populated town of Wall because the local doctor told them he'd give them all his prescriptions, so he told the local paper years later. Despite...