A report in yesterday’s New York Times shows a dramatic drop in the prevalence of human papilloma viruses amongst teenage American girls over the past decade. HPV causes cervical cancer and genital warts. Experts ascribe the drop to the use of the HPV vaccine. In fact, the drop is  steeper than predicted because the minority of girls using the vaccine seem to have made their peers less likely to contract HPV as well — an effect known as herd immunity. In the article, Dr Amanada Dempsey of the University of Colorado reports that some parents are still very resistant because of “a vague sense that there’s some controversy.” The sobering truth is that girls in twenty years time will die of cervical cancer because their parents were too idle to investigate the truth behind a lawyer-induced “a vague sense …[of] controversy”