Atrial Cross, convento San Agustín de Acolman, mid-16th century Speakers: Dr. Lauren Kilroy-Ewbank and Dr. Beth Harris For more on this cross and more art history: http://smarthistory.org/atrial-cross-acolman/.
Attaching the LED eyes. Created by Karl Wendt.
Octavian is victorious over Marc Antony and Cleopatra and becomes Augustus, first emperor of the Roman Empire.
Augustus of Primaporta, 1st century C.E. (Vatican Museums). Speakers: Dr. Beth Harris and Dr. Steven Zucker. Created by Beth Harris and Steven Zucker.
In addition to discretionary fiscal policy, there are policies and institutions that can help reduce swings in the business cycle. This video discusses the role of automatic stabilizers in the business cycle.
Sal solves a word problem to find average velocity and speed of an object in one-dimension.
KA's historian Kim Kutz Elliott talks about strategies for improving your historical essays.
An overview of how Tenochtitlan creates the tributary Aztec Empire in the 15th Century (from the Triple Alliance). They rule until being conquered by Hernando Cortez. Created by World History Project.
"FANBOYS" is a mnemonic device you can use to help remember the coordinating conjunctions of English. Team Grammar made this video, figuring that we couldn't very well cover conjunctions without writing a song, now could we? If you're moved to make your own version, send it our way at remix@khanacademy.org; we're excited to hear what you do!
The apostrophe has a bizarre history, including being the name for something that's not really related to grammar at all. David, Paige, and special guest Jake explain.
David, Paige, and Jake cover the fascinating history of the possessive apostrophe. Stay tuned for this bonus video!
David and Paige tackle the great comma debate of our time: Oxford comma or no Oxford comma?
Why does "goose" become "geese" and "foot" become "feet"? David the Grammarian and Jake the Linguist explain.
You may have been hearing a lot about the "singular they" recently. But what is it? How does it work, what is its history, and is it grammatical? Let's find out.
Trace the legacy of Babylonian discoveries and ideas, including their mathematical system based on 60 and their desire to predict the future. With British Museum curator Irving Finkel. © Trustees of the British Museum. Created by British Museum.
Back of the envelope calculation of which office space to rent. Created by Sal Khan.
Backwardation and the theory of Normal Backwardation. Created by Sal Khan.
Thinking about why backwardation in commodities markets is bullish. Created by Sal Khan.
Francis Bacon, Triptych - August 1972, 1972, oil on canvas, 72 x 61 x 22 in. (183 x 155 x 64 cm), (Tate Modern, London) . Created by Beth Harris and Steven Zucker.
Alternate plans and moral hazard. Created by Sal Khan.