(CBS) No other object is shaped quite like it. Unique yet ubiquitous, it was the tool upon which all other tools were made for centuries. It is the common anvil. "How do you feel when you're surrounded by anvils?" CBS News correspondent Steve Hartman asked anvil enthusiast Gay Wilkerson. "I'm happy," Wilkerson said. Although Wilkerson's garage in Farmington, Mo., is lined with anvils, this story is about a lot more than just a collection. "Can we call it an obsession?" Hartman asked. "I think so," Wilkerson said. "I think it is. I think it is, yeah." About 20 years ago,...