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How Transistors Work
electronics.howstuffworks.com/transistor.htm
The transistor moved the world from power-hungry vacuum tubes to portable solid-state electronics. Learn about transistors and how they changed electronics.
How Crash Testing Works
auto.howstuffworks.com/car-driving-safety/accidents-hazardous-conditions/crash-test.htm
Automotive crash testing has saved thousands of lives by making cars safer. Learn about the tests, the ratings and how the dummies tell engineers what happens in an accident.
How Four-Wheel Drive Works
auto.howstuffworks.com/four-wheel-drive.htm
A four-wheel drive system helps provide traction on snow or ice. Find out about four-wheel drive, the forces involved and see a simple four-wheel drive system.
How Aerodynamics Work
auto.howstuffworks.com/fuel-efficiency/fuel-economy/aerodynamics.htm
Aerodynamics is the study of how air resistance and drag affect an object. Read this article to learn how aerodynamics is used in car design.
Cholesterol Tests
health.howstuffworks.com/medicine/tests-treatment/cholesterol-tests.htm
A cholesterol test is the first step in getting your blood-cholesterol level under control. Find out what happens in this simple blood test.
Traction Control Systems Explained
auto.howstuffworks.com/28000-traction-control-explained.htm
Traction control helps limit tire slip in acceleration on slippery surfaces. Many of today's vehicles employ electronic controls to limit power delivery for the driver, eliminating wheel slip and helping the driver accelerate under control.
How To Calculate Your Pregnancy Due Date
Once your pregnancy has been confirmed, what you most want to know is your due date. The average length of a pregnancy is 40 weeks, or 280 days, from the first day of the last normal menstrual period. Here's an example of how it works.
Watch Your Six: Military Jet Pictures
science.howstuffworks.com/military-jets.htm
This military jets image gallery shows some of the planes used by the U.S. Air Force. Take a flight through these military jet pictures.
Light It Up!: True or False Smoking Quiz
play.howstuffworks.com/quiz/smoking-quiz
How savvy are you about smoking? The answers to our 10-question quiz may surprise you. Learn interesting facts about smoking and your health.
What percentage of air pollution is due to cars?
auto.howstuffworks.com/percentage-of-air-pollution-due-to-cars.htm
What percentage of air pollution is due to cars? Visit HowStuffWorks to learn what percentage of air pollution is due to cars.