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American progress in the Pacific in 1944
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In 1944, the Americans (and Allies) make even more progress in the Pacific. By the end of the year, they have taken positions that put them within bombing range of Japan.

Subject:
History
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/26/2021
American put options
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Unlike European option, an American options can be exercised at any point before it expires. In this video we walk through the process of exercising an American put option. Created by Sal Khan.

Subject:
Economics
Social Science
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/25/2012
Anatomy of a neuron
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Neurons (or nerve cells) are specialized cells that transmit and receive electrical signals in the body. Neurons are composed of three main parts: dendrites, a cell body, and an axon. Signals are received through the dendrites, travel to the cell body, and continue down the axon until they reach the synapse (the communication point between two neurons).

Subject:
Anatomy/Physiology
Biology
Life Science
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
02/11/2010
Ancient Mesopotamia
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Why is Mesopotamia considered the "cradle of civilization"? Sal explains the history of the early empires on the Tigris and Euphrates rivers.

Subject:
History
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/26/2021
Ancient Persia
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This overview of Ancient Persia explains the origins of the term "Persia" and Zoroastrianism; it also puts the Median, Achaemenid, Seleucid, Parthian, Sassanian dynasties in context.

Subject:
History
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/26/2021
Angular momentum
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Introducing angular momentum conceptually starting from linear momentum. Also covers some real-life examples. Created by Sal Khan.

Subject:
Physical Science
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/02/2021
Angular motion variables
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David explains the meaning of angular displacement, angular velocity, and angular acceleration. Created by David SantoPietro.

Subject:
Physical Science
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
David SantoPietro
Date Added:
07/02/2021
Angular velocity and speed
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In uniform circular motion, angular velocity (𝒘) is a vector quantity and is equal to the angular displacement (Δ𝚹, a vector quantity) divided by the change in time (Δ𝐭). Speed is equal to the arc length traveled (S) divided by the change in time (Δ𝐭), which is also equal to |𝒘|R. And arc length (S) is equal to the absolute value of the angular displacement (|Δ𝚹|) times the radius (R).

Subject:
Physical Science
Physics
Material Type:
Lesson
Provider:
Khan Academy
Provider Set:
Khan Academy
Author:
Sal Khan
Date Added:
07/02/2021