How do fluids act when they are moving? A thorough video lesson explains the characteristics of fluids while in motion. Building from the previous lesson in the series, the 15th installment of a Crash Course physics series provides an...

Keep the knowledge flowing in your physics classroom! An in-depth video lesson discusses the characteristics of fluids. The narrator includes Pascal's Principle and Archimede's Principle as well as buoyant force. This is the 14th lesson...

The North Star changes — it was previously Thuban but now is Polaris, and in the future, it will be Vega. The video discusses the cycles observed in the sky with only your eyes. It focuses on the zodiac constellations and why they are...

A large amount of ice exists on the moon making colonization that much easier. The video discusses the creation of the moon and the materials and features on it. It also discusses the reasoning behind our moon being just one of...

Gravity impacts the way you throw a ball and the way the Haumea travels around the sun. The video introduces gravity as a force. It describes the various types of orbits, escape velocity, and weightless mass. 

We directly see only four percent of the universe. The video introduces astronomy and encourages viewers to think bigger. Starting with what science is and how we define astronomy, it then continues into the many ways astronomy has...

Over half of the missions sent to Mars failed. Our closest neighbor in the solar system has a fascinating history that we just started learning. The video offers insights into this interesting planet that is literally covered in rust!

The surface temperature on Venus compares with the temperatures used to melt lead. The video discusses the size and atmosphere of Venus as well as the heat and backward rotation. It concludes with volcanic activity and the possibility...

The most elliptical orbit of any planet belongs to Mercury. The video includes obvious facts about Mercury such as the hot temperature and lack of magnetic field. It also discusses highly surprising facts such as the cracks, ice, and...

Your fingernails grow at approximately the same rate Earth's continents move. The video discusses Earth as a planet, its layers, our magnetic field, the atmosphere, and the human impact on Earth. It provides interesting facts that...

Our future literally depends on the sun. The video introduces the sun as a star. It explains the plasma magnetic fields, sunspots, solar flares, coronal mass ejections, and more. It concludes with how we rely on the sun, how we protect...

Today scientists watch other solar systems forming, helping to inform us how we got our start. The video covers what makes up the solar system, how we went from gas to a disk, how the planets formed, and the motion in the system. The...

Tides go in and tides go out, but how do they relate to gravity and the moon? The video explores the relationship of gravity over distance, tidal force parameters, the battle of the bulges, and tidal lock. It connects not only the ocean...

According to the video, astronomy is like a jigsaw puzzle with an infinite number of pieces. The video explains the history and invention of telescopes, how they work, refraction versus reflection, and the changing technology. It...

In the distant future, the moon will be so far away that there will no longer be any total eclipses. The video explains both lunar and solar eclipses, the moon's orbit, and the size of Earth and the moon. It highlights new vocabulary...

The moon is up at night the same amount of time it is up during the day. The video discusses why the moon has phases, how even ancient people knew it was a sphere, and each moon phase. It focuses on each moon phase individually, not only...

Money may not be able to buy happiness, but economic security can certainly contribute to overall happiness. A video from Crash Course economics presents the ways happiness can and cannot be quantified, including the value of intrinsic...

Is providing aid to foreign countries always beneficial? High schoolers explore the basics of foreign aid and remittance, including the percentage of the United States budget that is allocated to foreign aid, and the ways that nonprofits...

Hemoglobin which is red, carries oxygen in RBC, and is responsible for the color of our blood. Video 32 in a series of 47 focuses on how your blood exchanges oxygen and carbon dioxide to maintain homeostasis. Scholars see how hemoglobin...

Your eye cells come in different shapes and serve different functions; rod-shaped cells see shapes and cone-shaped cells see color. Video 18 in the series of 47 teaches all about vision. Scholars see (no pun intended!) how vision works....

This video focuses on social development; it is the 13th episode of the Crash Course Sociology. What makes you you? How did you get to be that way? Today we're talking about social development, starting with the role of nature and...

Crash Course Philosophy video in which Hank discusses the concept of evil and perspective of theists vs atheists. [10:03]

Knowing that the universe is expanding, and how quickly it's expanding allows scientists to run the clock back 14 billion years to the way the universe began- with a bang. [13:23]

A Crash Course video investigating the United States' involvement in the Cold War. [13:34]