I'm a science journalist. That keeps me busy, because, as you know, most peer-reviewed scientific claims are wrong. So I'm a skeptic, but with a small s, not capital S. "The Science Delusion" is common among Capital-S Skeptics. You don't apply your skepticism equally. You are extremely critical of belief in God, ghosts, heaven, ESP, astrology, homeopathy and Bigfoot. Meanwhile, you neglect [many] dubious and even harmful claims promoted by major scientists and institutions. Let's take a look at ... mainstream medicine. Over the past half-century, physicians and hospitals have introduced increasingly sophisticated, expensive tests. They assure us that early detection of disease will lead to better health. But tests often do more harm than good. For every woman whose life is extended because a mammogram detected a tumor, up to 33 receive unnecessary treatment, including biopsies, surgery, radiation and chemotherapy. For men diagnosed with prostate cancer after a PSA test, the ratio is 47 to one. Similar data are emerging on colonoscopies and other tests. Mental-health care suffers from similar problems. The biological theory that really drives me nuts is the deep-roots theory of war. According to the theory, lethal group violence is in our genes. But the evidence is overwhelming that war was a cultural innovation. I hate the deep-roots theory not only because it's wrong, but also because it encourages fatalism toward war. War is our most urgent problem.