Play a guessing game with Bert and Ernie in this video. Video shows a game played by the two characters as Bert tries to guess what Ernie is doing.

In this video, Paul Henne describes the ad hominem fallacy, which is an informal fallacy that arises when someone attacks the person making the argument rather than their argument. He also describes the four subtypes of this fallacy. [8:10]

In this video, Matthew C. Harris explains the fallacy of denying the antecedent, the formal fallacy that arises from inferring the inverse of a conditional statement. He also explains why graduate students might also be humans. [3:35]

In this video, Julianne Chung offers a brief introduction to ad hominem fallacies or fallacies of personal attack. She surveys six different types (abusive ad hominem, circumstantial ad hominem, tu quoque, guilt by association, genetic...

In this video, Matthew C. Harris of Duke University explains the informal logical fallacy called begging the question and the associated concept of circular reasoning. [3:53]

In this video, Jordan MacKenzie discusses a type of informal fallacy known as the argumentum ad populum fallacy, or the appeal to the people fallacy. This fallacy occurs when one attempts to establish the truth of a conclusion by...

In this video, Matthew C. Harris explains the fallacy of affirming the consequent, the formal fallacy that arises from inferring the converse of an argument. [3:25]

In this video, Geoff Pynn follows up on his introduction to critical thinking by exploring how abductive arguments give us reason to believe their conclusions. Good abductive arguments don't guarantee their conclusions, but give us very...

Queen Sara and King Friday want to put a new piece of playground equipment in the playground, but they can only choose one - a swing or a slide. So, they explain the process of voting to Daniel Tiger and his friends and ask them to stop,...

In this Wireless Philosophy video, Joseph Wu (University of Cambridge) introduces you to the straw man fallacy. This fallacy is committed whenever someone misrepresents an opponent's claim in arguing against it. [5:58]

In this Wireless Philosophy video, Joseph Wu (University of Cambridge) introduces you to the slippery slope argument. This argument is that when one event occurs, other related events will follow, and this slippery slope will eventually...

In this Wireless Philosophy video, Joseph Wu (University of Cambridge) introduces you to the red herring, a rhetorical device, and the fallacy that is often difficult to spot. A red herring occurs when something is introduced to an...

In this video, Paul explains the post-hoc-ergo-propter-hoc fallacy. This is an informal fallacy committed when a person reasons that because one event happened after another event, the first event caused the second. [5:41]

Joseph Wu (University of Cambridge) explains the fallacy of equivocation, the fallacy that occurs when the same term is used with different meanings in an argument. [6:29]

In this video, Paul Henne describes the fallacy of division, the informal fallacy that arises when we assume that the parts of some whole must have the same properties as the whole they make up. [4:51]

In this video, Paul Henne describes the fallacy of composition, an informal fallacy that arises when we assume that some whole has the same properties as its parts. [3:58]

In this video, Paul describes the distinction between formal and informal fallacies.

The perfect logicians are at it again.

What happens when 100 perfect logicians have to figure out if they each have a blue forehead?

Saving Earth from becoming a mushroom farm.

This video explains the difference between inductive and deductive reasoning and then discuss a given example.

Video gives example of solving a radical equation with all steps given. Goes through checking the answer and discusses whether the problem uses inductive or deductive reasoning.

In this video, Laurie Santos (Yale University) discusses why knowing about our cognitive biases is not enough to overcome them. She'll introduce a new cognitive error known as the G.I. Joe Fallacy, the tendency for our biases to stick...

Justin invites us to think about conditional sentences ('if P then Q'). Perhaps surprisingly, the question of what these sentences mean has vexed philosophers for thousands of years. In part one, Justin motivates the question and...