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Pbs Learning Media: Crash Course Astronomy: Moon Phases
Learn why the moon has phases and what those phases are. Because the moon is a sphere and orbiting the earth every 29.5 days, the way we see it in the night sky changes with time. Learn what the phases of the moon are: why they occur,...
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Pbs Learning Media: Crash Course Us History: Obamanation
In which John Green teaches you about recent history. John covers the end of George W. Bush's administration and the presidency of Barack Obama (so far). John will teach you about Obama's election, some of his policies like the...
PBS
Pbs Learning Media: Crash Course Astronomy: Brown Dwarfs
While Jupiter is nowhere near massive enough to initiate fusion in its core, there are even more massive objects out there that fall short of that achievement, and they are called brown dwarfs. Brown dwarfs have a mass that places them...
PBS
Pbs Learning Media: Crash Course Us History: The New Deal
In which John Green teaches you about the New Deal, which was President Franklin D. Roosevelt's plan to pull the United States out of the Great Depression of the 1930's. John will teach you about some of the most effective and some of...
PBS
Pbs Learning Media: Crash Course Us History: The Cold War
In which John Green teaches you about the Cold War, which was the decades long conflict between the USA and the USSR. The Cold War was called cold because of the lack of actual fighting, but this is inaccurate. There was plenty of...
PBS
Pbs Learning Media: Crash Course Astronomy: The Milky Way
Today we're talking about our galactic neighborhood: The Milky Way. It's a disk galaxy, a collection of dust, gas, and hundreds of billions of stars, with the Sun located about halfway out from the center. [10:59]
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Pbs Learning Media: Crash Course Astronomy: Neutron Stars
In the aftermath of an 8-20 solar mass star's demise we find a weird little object known as a neutron star. Neutrons stars are incredibly dense, spin rapidly, and have very strong magnetic fields. Neutrons stars with the strongest...
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Pbs Learning Media: Crash Course Astronomy: Distances
How do astronomers make sense out of the vastness of space? How do they study things so far away? Today Phil talks about distances, going back to early astronomy. Ancient Greeks were able to determine the the size of the Earth, and from...
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Pbs Learning Media: Crash Course Astronomy: Deep Time
As we approach the end of Crash Course Astronomy, it's time now to acknowledge that our Universe's days are numbered. [15:00]
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Pbs Learning Media: Crash Course Astronomy: Nebulae
Astronomers study a lot of gorgeous things, but nebulae might be the most breathtakingly beautiful of them all. Nebulae are clouds of gas and dust in space. Some nebulae are small and dense, others can be dozens or hundreds of light...
PBS
Pbs Learning Media: Crash Course Astronomy: The Moon
Take a tour of the moon, the closest astronomical object to Earth. Learn theories of the moon's formation, understand its surface features and how they formed, like the highlands and maria, and the moon's internal structures. [9:47]
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Pbs Learning Media: Crash Course Astronomy: Eclipses
In this episode, Phil breaks down what happens during a solar and lunar eclipse and provides tips for safely viewing a solar eclipse. Learn how the Ancient Greeks calculated a close estimation of the earth and moon's actual size two...
PBS
Pbs Learning Media: Crash Course Astronomy: The Earth
Learn all about planet Earth, from the composition of its internal structure and core, to its shifting continental plates, and placement in the solar system. We take a tour of Earth's inner and outer core, the origins of the planet's...
PBS
Pbs Learning Media: Crash Course Astronomy: Asteroids
Asteroids are chunks of rock or metal, or both, that were once part of a planet, but were destroyed after collisions. Most asteroids orbit the Sun between Mars and Jupiter, but some get near the Earth. The biggest asteroid, Ceres, is far...
PBS
Pbs Learning Media: Crash Course Government and Politics: How a Bill Becomes a Law
The process of how a bill becomes a law can be pretty complex. As if just getting through committee isn't difficult enough, bills have to navigate a series of amendments and votes in both houses, potentially more committees, further...
PBS
Pbs Learning Media: Crash Course Government and Politics: Congressional Leadership
In this episode, Craig Benzine explores the leadership structure of congress. We'll break out the clone machine to examine the responsibilities of the speaker of the house, the majority and minority leaders, as well as the majority and...
PBS
Pbs Learning Media: Crash Course Government and Politics: Congressional Committees
In this episode, Craig Benzine discuses the role of committees in congress. We'll talk about standing committees, joint committees, conference committees, and caucuses (and not the candidate-choosing kinds), as well as the staff agencies...
PBS
Pbs Learning Media: Crash Course Artificial Intelligence: Unsupervised Learning #6
We're moving on from artificial intelligence that needs training labels, called Supervised Learning, to Unsupervised Learning which is learning by finding patterns in the world. We'll focus on the performing unsupervised clustering,...
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Pbs Learning Media: Crash Course Artificial Intelligence: Training Neural Networks #4
We're going to talk about how neurons in a neural network learn by getting their math adjusted, called backpropagation, and how we can optimize networks by finding the best combinations of weights to minimize error. [12:08]
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Pbs Learning Media: Crash Course Anatomy and Physiology: Muscles, Part 1: Muscle Cells
We're kicking off our exploration of muscles with a look at the complex and important relationship between actin and myosin. Your smooth, cardiac, and skeletal muscles create movement by contracting and releasing in a process called the...
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Pbs Learning Media: Crash Course Us History: The Quakers, the Dutch, and the Ladies
John Green teaches you about some of the colonies that were not in Virginia or Massachusetts. Old New York was once New Amsterdam. Before the English got there though, the colony was full of Dutch people who treated women pretty fairly,...
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Pbs Learning Media: Crash Course Us History: Ford, Carter, and the Economic Malaise
In which John Green teaches you about the economic malaise that beset the United States in the 1970s. A sort of perfect storm of events, it combined the continuing decline of America's manufacturing base and the oil shocks of 1973 and...
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Pbs Learning Media: Crash Course Government and Politics: Controlling Bureaucracies
In which we learn how bureaucracies are kept in check. In prior episodes, we discussed what bureaucracies are, and why they are formed. In this episode, we finish our discussion of bureaucracy by looking at methods that other branches of...
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Pbs Learning Media: Crash Course Anatomy and Physiology: Blood, Part 1: True Blood
Now that we've talked about your blood vessels, we're going to zoom in a little closer and talk about your blood itself. We'll start by outlining the basic components of blood, including erythrocytes, leukocytes, platelets, and plasma,...