Khan Academy: Fundamentals: Necessary and Sufficient Conditions

In this video, Kelley builds on the understanding of necessary and sufficient conditions laid out in her previous video on the topic. In addition to providing further illustrative examples, Kelley addresses a new complexity: that our...

Test your knowledge of the distinction between necessary and sufficient conditions.

In this Wireless Philosophy video, Paul Henne (Duke University) explains the difference between correlation and causation. [7:08]

Read the passage about cats and dogs and conditioning and then complete the five questions following.

The concept of justification is fundamental to good, careful thinking. But what does it mean for a belief or action to be justified? In this video, Kelley sheds some light on how to assess whether a belief and action is justified. [3:11]

Did you know that for every dollar the US government spends they have to borrow $.40 of that dollar? Or that for every dollar of revenue the government brings in they are taking an equal amount in financial obligation? A video...

In this video, Kelley will go over how to identify implicit premises in all sorts of arguments and discuss when it is and is not acceptable to leave a premise implicit. [3:04]

In this video, Julianne Chung explains the philosophical concepts of truth and validity before going on to illustrate how truth and falsity, as well as validity and invalidity, can appear in various combinations in an argument.

In this video, Geoff Pynn explores how deductive arguments give us reason to believe their conclusions. Good deductive arguments guarantee their conclusions, and so must be valid and have true premises. [5:40]

What sort of things do we value and why? In this video Kelley distinguishes two different kinds of value: intrinsic and instrumental. Their distinctions are illuminated through the use of plenty of examples.