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What is a cavity in a tooth? Why do they drill it?

health.howstuffworks.com/wellness/oral-care/problems/question106.htm

What is a cavity in a tooth? Why do they drill it? If a cavity is a hole, why would you drill it to make the hole even bigger?

How Does a GFCI Outlet Work?

home.howstuffworks.com/question117.htm

In my bathroom there is a plug that has a "Test" and a "Reset" button. When I push the "Test" button, it cuts off the current to the outlet. What is this? How is it different from the fuse in the fuse box?

What's the Secret Behind the Numbers on the Interstate Signs?

auto.howstuffworks.com/numbers-on-interstate-signs.htm

Why is one road named I-5 while another is I-480? We take a closer look at the digits on those red, white and blue shield-shaped signs.

10 Easiest Countries to Get Dual Citizenship (In Case You're Wondering)

people.howstuffworks.com/easiest-countries-to-get-dual-citizenship.htm

Many people look into the easiest countries to get dual citizenship when they want greater mobility, financial flexibility or a backup place to live. Dual citizenship means a person is a legal citizen of two countries simultaneously, often holding two passports and access to rights in both nations.

How does a fiber optic cable work?

electronics.howstuffworks.com/question402.htm

Fiber optic lines have taken over and transformed the long distance telephone industry. Learn how fiber optic lines work.

Submarine Pictures

science.howstuffworks.com/submarine-pictures.htm

This submarine image gallery will give you an inside look into one of the Navy's most sophisticated war machines. Check out these submarine pictures.

How to Make Beaded Hair Accessories

lifestyle.howstuffworks.com/crafts/bead-crafts/beaded-hair-accessory.htm

Kids can learn how to make beaded hair accessories with our easy instructions and illustrations. Learn more about how to make beaded hair accessories.

What Is a Watt?

science.howstuffworks.com/environmental/energy/question501.htm

Amps, volts, watts, and ohms are the main units used for measuring electricity. Find out how amps, watts, volts, and ohms relate to electricity.

Are bagless vacuums better for people with allergies?

health.howstuffworks.com/diseases-conditions/allergies/indoor-allergies/bagless-vacuums-better-for-allergies.htm

Are bagless vacuums better for people with allergies? Visit Discovery Health to find out if bagless vacuums are better for people with allergies.

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