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...

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...

What is the difference between a suspension and an appoggiatura? This music theory lesson explains how appoggiaturas are leaning notes and how to write them as dissonances moving by step to consonances It then explains the difference...

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

This video presents an exercise on how to apply HTML tags.
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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...

👉 Learn how to find the derivative of a function using the chain rule. The derivative of a function, y = f(x), is the measure of the rate of change of the function, y, with respect to the variable x. The process of finding the derivative...

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)!

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...

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...

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!

Springtime Animals! See all the different springtime animals. These animals are ones that you would see in the woods, forest or country side, coming out of their homes after a long winter. This is a great video for young kids and...

Wai Lana demonstrates an asana to strengthen the arms and stretch the whole body. Then a variety of poses work the abs and stretch the hamstrings.

Learn how to solve with similar polygons. Two polygons are said to be similar if the corresponding angles are congruent (equal). When two polygons are similar the corresponding sides are proportional. Knowledge of the length of the sides...

👉 Learn how to find the derivative of a function using the product rule. The derivative of a function, y = f(x), is the measure of the rate of change of the function, y, with respect to the variable x. The process of finding the...

This video demonstrates how to add CSS to web pages and focuses on CSS syntax.
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This clip is from the chapter "Mobile-first Responsive Design in Cascading Style Sheets (CSS) and Web Design" of the series "Modern Web Design...

Learn about Music Theory Lessons for Kids Tempo!

This video explains the box model and its workings.
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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...

This video explains the append() and prepend() methods.
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This clip is from the chapter "Common JavaScript Questions and Answers for Interview Preparation and Practice" of the series "Modern Web Design with HTML5, CSS3, and...

How are the voice parts written in a score of a piece for Choir and accompaniment? Using an example by Rossini this music theory lesson shows you why it’s necessary to write the vocal parts in open score and how it deals with word...

This video shows how to add comments in HTML.
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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 create web pages...

A small molecule that can chemically bond in chains or groups to other similar molecules, to form larger molecules called polymers.
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A Twig Science
Glossary Film.
Key scientific terms defined in just 60 seconds...

What causes a financial crisis?<b<br/>r/>

You may think of long lines of angry depositors at the bank. But Cornell economist Matthew Baron says it’s more about credit booms and over-lending than<br/> we’ve thought before.

Woo. Let's just say this is a heated topic for me! I hope this vlogue sheds some light on your training and allows you a chance to step back and make sure you are being taught well. Remember, your physical health is what's most...