Ever wonder how Einstein proved E=mc2? This is how. Pi day (3.14) is Albert Einstein's Birthday! To celebrate, we'll explain 4 of his most groundbreaking papers from 1905, when he was just 26 years old

How Einstein (& others) discovered Special Relativity. Pi day (3.14) is Albert Einstein's Birthday! To celebrate, we'll explain 4 of his most groundbreaking papers from 1905, when he was just 26 years old.

Euler's formula, e^{pi i} = -1, is one of the most famous expressions in math, but why on earth is this true? A few perspectives from the field of group theory can make this formula a bit more intuitive.

A classic problem that Johann Bernoulli posed to famous mathematicians of his time, such as Newton, and how Bernoulli found an incredibly clever solution using properties of light.

A classic problem that Johann Bernoulli posed to famous mathematicians of his time, such as Newton, and how Bernoulli found an incredibly clever solution using properties of light.

The enigmatic equation e^{pi i} = -1 is usually explained using Taylor's formula during a calculus class. This video offers a different perspective, which involves thinking about numbers as actions, and about e^x as something which...

The enigmatic equation e^{pi i} = -1 is usually explained using Taylor's formula during a calculus class. This video offers a different perspective, which involves thinking about numbers as actions, and about e^x as something which turns...

Ever wonder how Einstein proved E=mc2? This is how. Pi day (3.14) is Albert Einstein's Birthday! To celebrate, we'll explain 4 of his most groundbreaking papers from 1905, when he was just 26 years old

Why is it hard to move a heavy bookcase across a carpeted floor? And why is it easier to keep it moving than it was to get it started moving? You might think it's all about weight, but actually it's about friction. Two kinds of friction!...

What's better than slipping and sliding in your backyard on a hot summer day? It's so much fun! But, how does this fun happen? It has a little something to do with friction!

How Einstein (& others) discovered Special Relativity. Pi day (3.14) is Albert Einstein's Birthday! To celebrate, we'll explain 4 of his most groundbreaking papers from 1905, when he was just 26 years old.

In this video Paul Andersen explains how plate tectonics explains the large-scale system interactions on our planet. Large plates float on the mantle and interact to form the major landforms on the planet. Evidence for plate tectonics...

Friction always acts to oppose sliding motion, even when it makes an object speed up. Learn how this works with a clear and simple example using a sliding disk and a moving block.

Howcast - Let belly dancer Irina Akulenko teach you how to do front-to-back chest slides in this belly dancing video from Howcast.

Howcast - Learn how to do sliding and phrasing elements from musician Sam Lipman in this Howcast slap bass lesson.

Howcast - Learn basic tutting moves in this Howcast dance video with choreographers Jamal Cumberbatch and Searich Wilson Hong.

Howcast - Learn how to do a tailslide from professional skateboarders Bam Margera and Kerry Getz in this Howcast skateboarding video.

Howcast - Learn how to do a bluntside from professional skateboarders Bam Margera and Kerry Getz in this Howcast skateboarding video.

Howcast - Learn how to do a Half Cab Noseslide from professional skateboarders Bam Margera and Kerry Getz in this Howcast skateboarding video.

Howcast - Check out part 5 and beat "I Am Alive" with the walkthrough for Ubisoft's new third person survival game!

Howcast - Let musician Alex Skolnick teach you how to use octaves on guitar in this heavy metal guitar lesson from Howcast.

Howcast - You can make the fox-trot as simple or as complicated as you want to – either way, you'll be a hit at the next wedding you go to.

Howcast - Learn how to play a sliding note on country guitar from musician Boo Reiners in this Howcast video.

Howcast - Learn how to improve your bowling release from former PBA touring player Mike D'Ambrosio in this Howcast bowling video.