Optics is the study of the properties and behavior of light. In this section you can learn about everything from holograms to lasers and lenses.
Brown Noise vs. White Noise: Which Is Best for Quality Sleep?
Can a sound wave kill you?
Can two cans and a string really be used to talk over a distance?
Why Do Bubbles Pop?
It's Elementary: The Periodic Table Quiz
10 Things You Should Never Mix With Alcohol
How Electricity Works
How Faraday Cages Work
How Gasoline Works
What do bugs have to do with forensic science?
5 Things You Didn't Know About Autopsies
Could Someone Really Find a Mummy in Their Backyard?
How Alchemy Paved the Way for Chemistry
How did Nikola Tesla change the way we use energy?
Time May Not Exist, Say Some Physicists and Philosophers
Why Does Ice Stick to Your Fingers?
What if I forgot to remove a piercing before an MRI?
A Kid-friendly Introduction to Magnets and Magnetism
We've Got Your Numbers Quiz
HowStuffWorks: Illustrated: Scutoids! Just Like Spheres and Cubes, But Not
11 Basic Math Symbols and How to Use Them
5 Hugely Fun Facts About Mass (Not Weight)
Antarctica's Spooky Cosmic Rays Might Shatter Physics As We Know It
Could Newly Measured W Boson Break the Standard Model?
Could an 'X17 Particle' Hint at a Fifth Force in the Universe?
Where do they get the particles for accelerators?
5 Baffling Subatomic Particles
It’s true: In 6 easy steps, you too can draw an impossible shape.
Imagine wearing a T-shirt with lettering on it while brushing your teeth. Why are the letters on the T-shirt reversed in the mirror, while your head appears right side up?
Your eyes aren't playing tricks on you. Those mountains way off in the distance really do look blue, and it's because of how light wavelengths scatter in the atmosphere.
By Mark Mancini
I have a thin piece of plastic mounted on the back window of my RV. It magnifies things so I can see better when I'm backing up. How can such a thin piece of plastic magnify things? A regular glass magnifying lens would have to be curved on both sides and much thicker.
Just about everyone has seen a television show or movie in which a criminal suspect is questioned while detectives watch from behind a one-way mirror. How does a piece of glass manage to reflect light from one side while remaining clear on the other?
If you want to see a hologram, you don't have to look much farther than your wallet. But the most impressive holograms are large scale and illuminated with lasers or displayed in a darkened room with carefully directed lighting. Learn how a hologram, light and your brain work together make clear, 3-D images.
Some of the brightest minds in history have focused their intellects on the subject of light. Einstein even tried to imagine riding on a beam of light. We won't get that crazy, but we will shine a light on everything scientists have found so far.
Primary colors are the blocks from which all other colors are built. But there's a lot more to know about them than the basic red, yellow and blue we learned about in kindergarten.
Is it its own special type of particle? A wave that's flowing through another medium? Or is there some creepy, unknown substance surrounding us that we simply don't perceive or understand?