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How does glow-in-the-dark stuff work?

science.howstuffworks.com/innovation/science-questions/question388.htm

You can find glow-in-the-dark item everywhere these days. Have you ever wondered how these items produce their light? Find out the answer to that question in this article.

Why Distant Mountains Appear Blue to the Naked Eye

science.howstuffworks.com/mountains-appear-blue.htm

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.

Can you get a glow-in-the-dark tattoo?

people.howstuffworks.com/culture-traditions/body-art/can-get-glow-in-dark-tattoo.htm

Now you see it, now you don't. Find out how a tattoo can go from invisible to visible with the flick of a light switch at HowStuffWorks.

Frequency Formula Basics: 2 Ways to Calculate Frequency

science.howstuffworks.com/math-concepts/frequency-formula.htm

Frequency is a fundamental concept when you're talking about waves, whether that means electromagnetic waves like radio waves and visible light, or mechanical vibrations like sound waves.

10 Types of Tuna for Sushi, Fish Tacos, and More

animals.howstuffworks.com/fish/types-of-tuna.htm

If you've ever stood in the seafood aisle wondering what separates a can of light tuna from the sleek bluefin sashimi at your favorite sushi bar, you're not alone.

9 Brown Cats From Siamese Chocolate Point to Havana Brown

animals.howstuffworks.com/pets/brown-cats.htm

Brown cats are relatively rare, rich in color, and surprisingly varied. These cats range from light tan to deep dark brown, offering pet lovers plenty of warm brown options.

How Well Do You Know Jesus' Sermon on the Mount?

play.howstuffworks.com/quiz/how-well-do-you-know-jesus-sermon-on-the-mount

Blessed are those who can ace this quiz on the Sermon on the Mount. If you know Jesus' famous teachings well, then let your light shine. And if you pass, your reward will be great!

How Turn Signals Work

auto.howstuffworks.com/turn-signal.htm

To most drivers, turn signals seem pretty simple: There's a lever that makes your signal lights flash. But there's actually some cool technology at work. Find out how this under-used device operates.

How Gas Lanterns Work

home.howstuffworks.com/gas-lantern.htm

Whether you're out camping or in the midst of a power outage, gas lanterns are handy devices. Did you know they're radioactive? Find out how these lanterns produce light.

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