Extended interview: Dr. Sanjay Gupta

In this web exclusive, Dr. Sanjay Gupta, a neurosurgeon and chief medical correspondent for CNN, talks with "Sunday Morning" host Jane Pauley about his new book, "It Doesn't Have to Hurt: Your Smart Guide to a Pain-Free Life." He discusses pain, which he calls "the most mysterious of all human sensations," and about the misconceptions about treating it.