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How Tunnels Work

science.howstuffworks.com/engineering/structural/tunnel.htm

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

Home Energy-Saving Systems

home.howstuffworks.com/green-living/home-energy-saving-systems-ga.htm

When you work on your home to make it more energy efficient and less expensive to maintain, you must also consider safety issues. Learn more.

How Hereditary Illnesses Work

science.howstuffworks.com/life/genetic/how-hereditary-illnesses-work.htm

Hereditary illnesses can be frightening to new parents, but they are usually rare. Learn about various genetic diseases and their causes.

How to Choose Clothes for a Child

lifestyle.howstuffworks.com/family/parenting/parenting-tips/how-to-choose-clothes-for-a-child.htm

Knowing how to choose clothes for a child means balancing ease and comfort with price. Learn about diapering and how to buy baby clothes.

How Bridges Work

science.howstuffworks.com/engineering/civil/bridge.htm

Bridges support tremendous weight, span huge distances and all the while withstand the greatest forces of nature. Find out about these engineering feats (as well as some of the flaws).

How Pro Wrestling Works

entertainment.howstuffworks.com/pro-wrestling.htm

Pro wrestling is one of the most popular forms of sports entertainment. Learn about the history of pro wrestling and see how pro wrestling moves are executed.

How Breast Implants Work

science.howstuffworks.com/innovation/everyday-innovations/breast-implant.htm

Breast implants are becoming a popular high school graduation present for parents in the U.S. to give their teens. Learn all about breast implants and the surgical process of augmentation.

How Social Security Numbers Work

people.howstuffworks.com/social-security-number.htm

Social Security numbers are assigned to each individual citizen by the federal government. Learn about Social Security numbers and how Social Security numbers are used.

How does your body know the difference between dominant and recessive genes?

science.howstuffworks.com/life/genetic/question669.htm

Ever since I took biology in high school I have wondered -- why do humans (and plants and animals) have two of every gene, and why is one "dominant" and the other "recessive"? How does my body know which one is dominant? How does it pick between the

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