In the 1600s, Isaac Newton conducted a series of experiments to better understand the lights and colors that sometimes appear when your eyes are closed. If you’ve ever sat around an evening campfire or unintentionally glanced at the Sun,...

What exactly are the invisible things out there, and how did they help form the universe as we know it? To explore and understand the most spectacular structures out there, scientists have been using cosmic shear to indirectly detect...

The energy in the universe never increases or decreases -- but it does move around a lot. Energy can be potential (like a stretched-out rubber band waiting to snap) or kinetic (like the molecules that vibrate within any substance). And...

One day, Echo was drifting through the woods and fell in love with a handsome young hunter named Narcissus. Cursed by Hera to only repeat the last words spoken by another, Echo was unable to converse with him and was soon cruelly...

Many species of mantis shrimp rely on their incredible punching abilities to stun their prey. But it turns out they don’t have to be mature mantis shrimp to start getting their punch on. And baby Philippine mantis shrimp can punch nearly...

Some people love the feeling of cracking their knuckles, while others cringe at the sound. But what causes that trademark pop? And is it dangerous? Eleanor Nelsen gives the facts behind joint popping.

We may never know when our ancestors walked out of the water into dry land. But it's possible they may have been walking in water for millions of years!

The other day I got bored and noticed this weird thing happened when I held my finger up to my eye, so I had to science it and figure it out! Let me know if you try these light-bending experiments too, especially that last one that I...

If you’ve been brave enough to open your eyes underwater, you might have noticed that everything is blurry. But fish have no trouble finding their way beneath the waves. So why can’t we see as clearly below as we do above?

In this video Paul Andersen explains how waves will diffract (or bend) around an obstacle or while traveling through and opening. Diffraction will be maximized when the size of the opening or obstacle matches the wavelength.

Howcast - Learn how to do a head nod dance move with this Howcast dance video with expert Tweetie.

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

Howcast - Learn how to do the arm swings dance move from fitness expert Rachel Warren in this hip-hop dance workout video from Howcast.

Howcast - Learn how to do a cable crossover working the inner chest from personal trainer Max Tapper in this home chest workout for men video from Howcast.

Howcast - Learn how to dance like Shakira from professional dancer Charlene "Chi-Chi" Smith in this Howcast dance video.

Howcast - Let musician Alex Skolnick teach you how to play one fret bends on guitar in this heavy metal guitar lesson from Howcast.

Howcast - Let musician Alex Skolnick teach you how to play overbend notes on guitar in this heavy metal guitar lesson from Howcast.

Howcast - Pick up four tips for beginner graffiti artists from master tagger Paes 164 in this Howcast video.

Howcast - Learn how to do one leg hooping from hula hooping expert Natalie "McFancy" Wise in this Howcast video.

Howcast - Learn how to bend strings in country guitar from musician Boo Reiners in this Howcast video.

Howcast -Learn how to bend a note, a basic guitar playing technique, in this Howcast video.

Howcast -Learn how to play a diatonic harmonica from music teacher Marcus Milius in this Howcast video.

Howcast -Learn how to do jackknives on a Swiss ball from certified personal trainer Amanda Edell in this Howcast ab workout video.

Learn how to use your arm parts to tut in this Howcast dance video with choreographers Jamal Cumberbatch and Searich Wilson Hong.