It’s common knowledge that you should never look directly at the sun. But, like, what about during an eclipse? Surely you can look then?

Niels Bohr, a Danish Physicist said “Everything we call real is made of things that cannot be regarded .” Is what we see perceived to be real or is it an illusion?

In the world of our mind’s eye, light travels in a straight line....

You know how moths like to fly into lamps or crawl all over your tv screen at night? Why do they do this?! The answer is more complicated than you might think...

A story of problem-solving styles, with the central example of finding the average area for the shadow of a cube.

An introduction to the quantum behavior of light, specifically the polarization of light. The emphasis is on how many ideas that seem "quantumly weird" are actually just wave mechanics, applicable in a lot of classical physics.

An introduction to the quantum behavior of light, specifically the polarization of light. The emphasis is on how many ideas that seem "quantumly weird" are actually just wave mechanics, applicable in a lot of classical physics.

Today we’re going to discuss how 3D graphics are created and then rendered for a 2D screen. From polygon count and meshes, to lighting and texturing, there are a lot of considerations in building the 3D objects we see in our movies and...

Since the days of Ancient Greece, philosophers and scientists have been wondering: What is space? Is the absence of things.... a thing? These questions continued to fascinate physicists in the modern era, leading Isaac Newton, Ernst...

Everyone is watching the sky during a solar eclipse, but but if you look down, you'll catch another kind of light show.

Traditional lab tests for disease diagnosis can be too expensive and cumbersome for the regions most in need. George Whitesides' ingenious answer is a foolproof tool that can be manufactured at virtually zero cost.

Join Hank Green as he explains why blacklights make some things glow!

You know how moths like to fly into lamps or crawl all over your tv screen at night? Why do they do this?! The answer is more complicated than you might think

More than half of all the matter in the universe is out in the dark, 'empty space.' Although it's basically invisible, the intergalactic medium has a lot to tell us about the stuff we can see.

LIGHT! Let's talk about it today. Sunlight, moonlight, torchlight, and flashlight. They all come from different places, but they’re the very same thing: light! It’s what makes it possible for us to see the world around us, so it’s worth...

From corundum to alexandrite, there are rare minerals have multi-colors caused by how they form their structure!<br/>

Light is everywhere … but it’s not as predictable as you might think. It’s a wave that travels in straight lines, yet it also reflects off of surfaces, refracts through various materials, and generally changes direction all the time!...

Learn how to see invisible air currents with this amazing optical setup!

Howcast - Learn four food photography tips from commercial photographer Dan Bracaglia in this digital camera lesson from Howcast.

Howcast - Learn eight photography lighting basics and tips from commercial photographer Dan Bracaglia in this video from Howcast.

Howcast - Learn what an endoscopy is from gastroenterologist Lisa Ganjhu, M.D. in this Howcast video about stomach problems and digestive disorders.

Howcast - Start your own seeds to save money, grow different plant varieties, and extend your growing season.

Howcast - Learn how to work with 3D effects in Adobe Illustrator from expert Will "Focus" Dubois in this Howcast video.

Howcast - A bug zapper is an electronic insect-control system that uses light to attract insects, and then kills them by electrocution. If you're bugged by bugs and want to live pest-free, you need to know what to look for in a bug zapper.

Introduce depth and realism to your drawings with shadows. It all starts with "seeing the light."