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Constructing a tunnel is one of the most complex challenges in the field of civil engineering. Learn about the basics behind tunnels.

Botanicals have been receiving a lot of press lately, but they can be dangerous. Learn about the safety of botanicals for seniors.

How do fog machines work?

What are the safety concerns of fuel cells? Check out HowStuffWorks.com to learn the safety concerns of fuel cells.

An alabaster smile is only a strawberry and some baking soda away. Learn more about whiten teeth with strawberries.

Nutrition is of vital importance while you are pregnant. Learn how important weight gain is during pregnancy and what foods to avoid.

Black boxes help investigators determine what happened in an airplane accident. What's inside a black box and how does it record flight data?

Knowing how essential oils work will help you be able to buy and store this integral part of aromatherapy treatments. Learn how essential oils work.

A gas leak is not a good thing. There's a reason it has that awful odor -- to warn you of danger. Learn more about the dangers of a gas leak.

Most people are more afraid of bears in the wild than moose. But, in Alaska, you're more likely to be injured by a moose than a bear. Find out why.

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