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10 Innovations in Water Purification

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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.

What % Adult Are You?

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The days of playing with toys and taking afternoon naps may be over, but we're going to prove that being an adult isn't so bad after all. Let's see how well you prioritize your responsibilities with this lifestyle quiz!

10 Types of Fish You'll Find on Restaurant Menus

recipes.howstuffworks.com/types-of-fish.htm

From sushi rolls to Friday fish fries, fish have a firm spot in cuisines around the world. With their shimmering scales, incredible variety and nutrient-rich profiles, the types of fish we eat go far beyond just "tuna or salmon."

What the Stuff?!: 5 Weird Facts About Biological Rhythms

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Turns out that every living thing - men, women, animals, plants, insects, and algae - all have internal "body clocks" determined by a variety of biological rhythms. So why do we have these clocks, and what do they do for us?

75 of the Hardest Riddles (With Answers) to Test Your Brain

lifestyle.howstuffworks.com/family/activities/hardest-riddles.htm

Challenge yourself with some of the hardest riddles we could find so you can keep your mind sharp! As you tackle these tricky brain teasers, you'll engage your mind in a way that few other activities can.

How the Chrysler ME Four-Twelve Works

auto.howstuffworks.com/chrysler-concept.htm

What has a better power-to-weight ratio than an Enzo Ferrari and enough room for a normal person to sit comfortably? It's the Chrysler ME Four-Twelve concept car (that's right, we said Chrysler). Check it out.

The Ultimate Auto Identification Quiz!

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So how many car models do you think you will be able to identify? Here we have 40 examples, spanning different decades and manufacturers. Do you have what it takes to ace the ultimate car identification quiz?

Can You Name Which Literary Classic These Characters Are From?

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Bookworms, this one's for you! With so many great works of literature, we're sure you can name many memorable characters that came out of these masterpieces. Can you easily identify these fictional characters? Answer our questions to see!

How Do Lava Lamps Work? The Science Behind Liquid Motion

science.howstuffworks.com/innovation/science-questions/how-does-lava-lamp-work.htm

You've seen them. Those iconic, mesmerizing liquid sculptures that dance inside a glass bottle, casting a warm and nostalgic glow. Yes, we're talking about the lava lamp. But, how do lava lamps work?

Which Nail Polish Color Is Right For You?

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A good manicure can put some pep in your step and add a finishing touch to any outfit - and we all have our signature look. What nail polish should you rock today? Take this quiz to find out!

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