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How to Find the Value of Old Books

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Finding the value of old books can sometimes be difficult. Visit HowStuffWorks for information on finding the value of old books.

How do painkillers know where you hurt?

health.howstuffworks.com/medicine/medication/how-do-painkillers-know-where-you-hurt.htm

As kids, we couldn't use big words to describe our scrapes, but we could point, and somehow the medicine knew where we hurt. It still does. How?

Inside 'The Water Horse'

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The Water Horse is a movie about the mythical Loch Ness Monster. Take an inside look at The Water Horse and see pictures from the Water Horse movie.

How Light Microscopes Work

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The human eye misses a lot -- enter the incredible world of the microscopic! Explore how a light microscope works.

Why is it so hard to quit smoking?

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It's hard to quit smoking because cigarette manufacturers make it hard. Find out what cigarette companies put in cigarettes to make it hard to quit smoking.

How Greenwashing Works

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Greenwashing is an attempt to convince consumers that their business has a low impact on the environment. Learn more about greenwashing.

Could an Attack on Undersea Cables Take Down the Internet?

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Much of the infrastructure that makes the internet possible lies on the bottom of the world's oceans. HowStuffWorks dives down to check them out.

Battle of the Best Sonar: 'Team Dolphin' vs. 'Team Bat'

animals.howstuffworks.com/mammals/battle-best-sonar-team-dolphin-or-team-bat.htm

Do dolphins or bats have better sonar? That question has led to some playful ribbing among scientists. HowStuffWorks wanted to find out, too.

18 Scariest Horror Movies to Guarantee You Won't Sleep Tonight

entertainment.howstuffworks.com/scariest-horror-movies.htm

Some horror movies just make you squirm. Others make you check the locks. But the scariest horror movies? These are the ones that invade your dreams, hijack your pulse, and make you reconsider walking down that dark hallway. They're disturbing, intense, and engineered to make your brain scream.

Can we end aging?

health.howstuffworks.com/medicine/modern-technology/end-aging.htm

Can we end aging? Or at least slow down the aging process? Take a look at different theories on how to end aging and see for yourself.

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