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Your search for "ultraviolet" returned 383 results
What vitamins help you deal with the summer heat?
health.howstuffworks.com/wellness/food-nutrition/vitamin-supplements/vitamins-for-summer-heat.htm
Summer heat getting you down? Turns out some vitamins can help you deal with the summer heat. Find out which ones.
Can You Pass This General Knowledge Quiz While Being Distracted by Adorable Puppies?
Could you name the largest planet in our solar sys- ... is that a Goldendoodle? Aww! Put your smarts - and your concentration - to the test in this puppy-filled general knowledge skills challenge.
Melasma Overview
health.howstuffworks.com/skin-care/problems/medical/melasma.htm
Melasma is a skin condition that darkens the skin. Learn more about how melasma works at HowStuffWorks.
Why don't we live underground?
people.howstuffworks.com/live-underground.htm
To live underground takes some serious planning: We've adapted to sunlight and air on the surface. Learn how to live underground and why it matters.
How Lasers Work
science.howstuffworks.com/laser.htm
Lasers are used in dental drills, eye surgery, tattoo removal, and (of course) laser pointers. Learn how different lasers generate such concentrated light.
How Air Purifiers Work
home.howstuffworks.com/air-purifier.htm
Americans spend an estimated $250 million annually on air purifiers for their homes. Learn why people buy air purifiers and how they work.
Skin Pigmentation
health.howstuffworks.com/skin-care/beauty/sun-care/skin-pigmentation.htm
Skin pigmentation is an interesting part of human anatomy. Visit HowStuffWorks to learn all about skin pigmentation.
Sun Spots
health.howstuffworks.com/skin-care/problems/medical/sun-spots.htm
Sun spots are a common skin problem. Learn more about how sun spots work at HowStuffWorks.
How Spray Paint Works
home.howstuffworks.com/spray-paint.htm
Spray paint has left an indelible mark on world culture. How did it go from home-improvement solution to cultural icon? Find out in How Spray Paint Works.
How Faraday Cages Work
science.howstuffworks.com/faraday-cage.htm
Thanks to the Faraday cage, we can control electricity and make it safer for our computers, cars and other inventions.