DR David Agus doesn’t sit while talking to me on the phone from his California-based office. “I’m walking around with headphones as we talk,” says Agus, professor of medicine at the University of Southern California (USC) Keck School of Medicine and author of a new book, The End of Illness.

Dennis Hopper is terminally ill and unable to undergo chemotherapy as he battles prostate cancer, his lawyer wrote in a court filing.