An introduction to Convex Lenses. Created by Sal Khan.
Some Convex Lens Examples. Created by Sal Khan.
In introduction to Convex Parabolic Mirrors. Created by Sal Khan.
Understanding alternate coordinate systems. Created by Sal Khan.
Coordinating conjunctions connect parts of sentences to each other. David explains how.
Core spiritual ideas of Buddhism by way of comparison with ideas from the Hindu Upanishads.
Understanding how most corporate debt is different than most personal mortgages. Created by Sal Khan.
Why people set up corporations. Created by Sal Khan.
Correcting the time difference calculation by taking into account that there is no year 0. Created by Sal Khan.
Correlative conjunctions work in pairs to connect parts of sentences. David teaches you how they do it!
Cosmic Background Radiation. Created by Sal Khan.
Cosmic Background Radiation 2 - Redshift of the Cosmic Background Radiation. Created by Sal Khan.
An introduction to the Cosmological Time Scale 1. Created by Sal Khan.
An introduction to the Cosmological Time Scale 2. Created by Sal Khan.
This 10-minute video lesson looks at the beginnings of life on Earth. Life and photosynthesis start to thrive in the Archean Eon. [Cosmology and Astronomy playlist: Lesson 39 of 85]
This 10-minute video lesson looks at the formation of the Earth which is a the byproduct of a local supernova. [Cosmology and Astronomy playlist: Lesson 38 of 85]
This 11-minute video lesson looks at Potassium-Argon (K-Ar) dating and it can be used to date very old volcanic rock and the things that might be buried in between. [Cosmology and Astronomy playlist: Lesson 79 of 85]
Benefits and drawbacks of modern political campaigns in the United States, including consultants, campaign costs, and social media.
Learn about how firms determine the optimal combination of capital and labor in this video.
A real-world example of the concepts behind the AD-AS model is the oil shocks the United States experienced in the late 1970s. In this video, we break down some of the events going on at the time and use the AD-AS model to see if our predictions using this model match what really happened. Created by Sal Khan.