Pesticides: Just How Bad Are They?

3D model of dichlorodiphenyltrichloroethane (DDT), an insecticide I think everyone would agree that it would not be a good idea to put pesticides in a saltshaker and add them to our food at the table. But there is little agreement when it comes to their use in agriculture. How much gets into our food? What

Defending Science-Based Medicine: 44 Doctor-Bashing Arguments …and Their Rebuttals

Supporters of alternative medicine and purveyors of quack remedies love to criticize conventional medicine and science. They keep repeating the same tired arguments that are easily rebutted. This handy guide will help skeptics answer common criticisms from doctor-bashers. Doctor-bashing is a popular sport practiced by believers in complementary and alternative medicine (CAM) and purveyors of

The Human Mold: Another Example of Self-Deception

  José Jarimba believes that our bodies are physically molded into an asymmetric form by our mothers’ sleeping positions during pregnancy, that this has lifelong adverse impacts on health, and that shoe inserts can eliminate pain and other health problems by realigning the body. This is a silly untested hypothesis by a single individual. As

The Unpersuadables

We would like to believe people are rational. We would like to believe that if they have formed a false belief based on inaccurate information and poor reasoning, they will change that belief when they are provided with accurate information and better reasoning. We are frequently disappointed. An example of what should happen I recently

How to Think

Robert Todd Carroll, the author of The Skeptic’s Dictionary, has a new book out: The Critical Thinker’s Dictionary: Biases, Fallacies, and Illusion and what you can do about them. Since some of our commenters and most of the CAM advocates we critique are constantly committing logical fallacies, a survey of logical fallacies is a good idea both for us

Food for Thought

I am excited to tell you about a wonderful new endeavor that is helping to promote critical thinking about science and medicine. It’s a free online course on “Food for Thought” that offers a scientific framework for understanding food and its impact on health and society from past to present. The “Food for Thought” course is a

Tribalism and Medical Ethics

Science is intended to discover the “is”, not the “ought;” facts, not values. Science can’t tell us whether an action is moral; it can only provide evidence to help inform moral decisions. For instance, some people who believe abortion is immoral reject birth control methods that prevent implantation of a fertilized ovum on the grounds

On Miracles 

Is there such a thing as a miracle? Miracles are defined as unusual events that are not explicable by scientific or natural laws and that are assumed to be the result of supernatural intervention. The very concept is so fuzzy that it borders on the unintelligible. Religious believers refer to many things as miracles: the

Thinking: An Unnatural Act

Unnatural Acts: Critical Thinking, Skepticism, and Science Exposed! By Robert Todd Carroll. James Randi Educational Foundation, 2011. Available through and other electronic outlets exclusively in e-book format, $9.99. Robert Todd Carroll, the author of the invaluable Skeptic’s Dictionary, has written an e-book that makes a perfect complement to his Dictionary. Titled Unnatural Acts: Critical