The Skeptic’s Dictionary
The Skeptic’s Dictionary features definitions, arguments, and essays on hundreds of strange beliefs, amusing deceptions, and dangerous delusions. It also features dozens of entries on logical fallacies, cognitive biases, perception, science, and philosophy.

Science Based Medicine
Science-Based Medicine is dedicated to evaluating medical treatments and products of interest to the public in a scientific light, and promoting the highest standards and traditions of science in health care. Online information about alternative medicine is overwhelmingly credulous and uncritical, and even mainstream media and some medical schools have bought into the hype and failed to ask the hard questions.

Quackwatch is an international network of people who are concerned about health-related frauds, myths, fads, fallacies, and misconduct. Its primary focus is on quackery-related information that is difficult or impossible to get elsewhere.

What’s the Harm
This site is designed to make a point about the danger of not thinking critically. Namely that you can easily be injured or killed by neglecting this important skill. We have collected the stories of over 670,000 people who have been injured or killed as a result of someone not thinking critically.

Thou Shalt Not Commit Logical Fallacies
A logical fallacy is a flaw in reasoning. Logical fallacies are like tricks or illusions of thought, and they’re often very sneakily used by politicians and the media to fool people. Don’t be fooled! This website has been designed to help you identify and call out dodgy logic wherever it may raise its ugly, incoherent head. 

Master List of Logical Fallacies

Many of these definitions overlap, but the goal here is to identify contemporary and classic fallacies as they are used in today’s discourse. No claim is made to “academic rigor” in this listing.