A measure of the speed of light in a medium, defined as the ratio of the speed of light in a vacuum, to its speed in the medium under consideration.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in...

Alex owns a supermarket; she placed an empty charity jar of the same size on each of her two counters. Jar A is marked by the following scale of fractions, one thirds, two thirds, 1. And jar B is marked by the following scale, one fifth,...

The U.S. is conducting a large-scale exercise in the Indo-Pacific region. <br/>

Illusions can be fun – that’s why magicians are so fascinating! But the Other Mother weaponises illusions to trap Coraline in her strange world. Can Coraline see through them in time? And how do illusions help us see our realities more...

Calling all aspiring writers! Join us for an overall summary of Virginia Woolf’s iconic extended essay A Room of One’s Own. Find out how she came to her famous conclusion about the importance of money and having your own space to write...

This video presents an exercise on how to apply HTML tags.
<
br/>
This clip is from the chapter "Creating Web Pages with HTML5" of the series "Modern Web Design with HTML5, CSS3, and JavaScript".This section demonstrates how to...

Eleven-year-old Coraline Jones loves exploring. Luckily for her, the family have just moved into a big old house in the English countryside. Behind a mysterious door in the drawing room a different world beckons. There is a woman with...

What exactly are double sharps and flats, and why are they needed? Find out today on Two Minute Music Theory as we look at sharps, flats, and naturals...also known as accidentals.

This video is answering the question of why do we have nose hairs.

MOT 1943: MERCHANT SEAMAN'S CLUB: EXT Merchant Seaman's Club. INT Club w/ Dorothy Mackaill (1903-1990) playing checkers w/ soldier. Actor Alfred Lunt (1892-1977) at stove cooking in kitchen. WWII

Today we look at one of music's most useful resources - the circle of fifths, and how we can build it.

Opposing pairs of muscles that move the same bone in opposite directions.
<

br/>

A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds using stunning images and concise textual definitions. Twig...

This video focuses on CSS font sizes.
<
br/>
This clip is from the chapter "Common Cascading Style Sheets (CSS) Questions and Answers for Interview Preparation" of the series "Modern Web Design with HTML5, CSS3, and JavaScript".This...

A super fun primary elementary music lesson for your classroom. Primary elementary music students will sing, move and test their listening skills for if the music has a beat or no beat.

Two astronauts are about to embark on the One Year Mission which can help us understand more about the long-term effects of being in space, and there is an upcoming total lunar eclipse (the shortest one this century)!

In carved stone and bold, tropical colors and sounds, Old Havana reflects Cuba’s complex history of conquest, slavery, liberation, and revolution. ➡ Subscribehttp://bit.ly/NatGeoSubscribe' target='_blank' rel='nofollow'>Subscribe...

TeD Fellow Andrew Pelling is a biohacker, and nature is his hardware. His favorite materials are the simplest ones (and oftentimes he finds them in the garbage). Building on the cellulose structure that gives an apple its shape, he...

* Viewer discretion advised. This video includes discussion of mature topics and may be inappropriate for some audiences. Ryan Lobo has traveled the world, taking photographs that tell stories of unusual human lives. In this haunting...

Nothing changed movies like the arrival of synchronous sound. NOTHING! Acting, directing, cinematography, and presentation all had to be rethought. Some studios were more quick to take on the challenge while others waited until the last...

Take a look behind the scenes of the National Geographic documentary film "Free Solo," which chronicles Alex Honnold's unbelievable free-solo climb up El Capitan. He is the first person to summit the near-vertical 3,000-foot face without...

This week, scientists have managed to make tear gland organoids that cry, and have also found a bunch of new genes involved in eye color!

What if the government ran more like Silicon Valley? Engineer Matt Cutts shares why he decided to leave Google (where he worked for nearly 17 years) for a career in the US government -- and makes the case that if you really want to make...

Cinematic love stories come in all shapes and sizes. Movies are really good at both capturing and projecting emotions. And one of the best directors at the modern love story is Wong Kar-Wai. In this episode of Crash Course Film...

Science can help solve the world’s most important problems, and what could be more important than keeping pee off your shoes? Yes, even the lowly urinal—and those who use it—can benefit from the occasional peer-reviewed study. So let’s...