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10 Innovations in Water Purification
science.howstuffworks.com/environmental/green-tech/sustainable/10-innovations-water-purification.htm
As far back as 1500 B.C.E., people were trying to purify water to make it drinkable. And we're still at it. Today inventors use tools as simple as clay and as sophisticated as carbon nanotubes to bring clean water to the world.
How Color Blindness Works
health.howstuffworks.com/human-body/systems/eye/colorblindness.htm
Color blindness is a condition that affects the way in which people see certain colors. Learn about color blindness and causes of color blindness.
How are lips different from other skin areas?
health.howstuffworks.com/skin-care/lip-care/health/lips-different-skin.htm
How are lips different from other skin areas? Visit HowStuffWorks to see how lips are different from other skin areas.
How dangerous are tanning beds?
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How dangerous are tanning beds? Visit HowStuffWorks to learn how dangerous tanning beds are.
How does skin produce vitamins?
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How does skin produce vitamins? Visit HowStuffWorks to learn more about vitamins produced by the skin.
What is cosmological redshift?
science.howstuffworks.com/cosmological-redshift.htm
Cosmological redshift: sounds like the latest blockbuster coming to a theater near you, doesn't it? In reality, it has to do with how light itself travels -- and understanding how it works is essential to advanced space telescope technology.
How to Remove Window Tint Without Professional Help
auto.howstuffworks.com/how-to-remove-window-tint.htm
Removing car window tint might seem like a tricky job, but with the right tools and patience, you can get it done yourself. Whether your tint film is bubbling, fading, or peeling, taking it off properly will prevent damage to your glass and give the car a fresh appearance.
How Impossible Colors (Like Stygian Blue) Work
science.howstuffworks.com/impossible-colors.htm
What if there are colors within the visible spectrum that our brains can't perceive? In fact, there are. They're called impossible colors. But some researchers think they've discovered a way to see the impossible.
Why are moths attracted to light?
animals.howstuffworks.com/insects/question675.htm
Moths and light seem to go hand-in-hand, but have you ever wondered why moths are attracted to light? Learn about moths and light in this article.
How does the sun affect people with dark complexions?
health.howstuffworks.com/skin-care/beauty/sun-care/sun-affect-dark-complexions.htm
How does the sun affect people with dark complexions? Visit HowStuffWorks to find out how the sun affects people with dark complexions.