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What does the computer in a car do?

auto.howstuffworks.com/under-the-hood/trends-innovations/question113.htm

What does the computer in a car do? What was the Y2K scare about our cars starting?

Why Does Hydrogen Peroxide Bubble When You Put It on a Cut?

science.howstuffworks.com/innovation/science-questions/question115.htm

Hydrogen peroxide is something that is used to clean cuts. Have you ever wondered why it foams when placed on a cut? Learn about hydrogen peroxide.

Could a car run on compressed air?

auto.howstuffworks.com/fuel-efficiency/fuel-consumption/question133.htm

A compressed air engine could be used to power a car, if you had a tank large enough to store it. Find out how a compressed air engine could power a car.

How does the sense of smell work?

health.howstuffworks.com/mental-health/human-nature/perception/question139.htm

What causes smell? When I walk into a bakery, I smell the bread. What actually has happened? Do objects give off pieces of matter? What has entered my nose to cause the sensation of smell?

How does a halogen light bulb work?

home.howstuffworks.com/question151.htm

A halogen light bulb is slightly different from a regular light bulb. Find out what makes a halogen light bulb different and how a halogen lamp works.