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Mechanical odometers have been counting the miles for centuries. Although they are a dying breed, they are incredibly cool inside. Learn how this simple device tracks distance and find out about digital odometers.
By Karim Nice
Why is it that at the scene of a car accident the broken glass is always in really small pieces yet when a baseball breaks a house window there are large jagged pieces?
How does a laser speed gun work to measure a car's speed? How is it different from a radar gun?
Air bags have saved thousands of lives since their introduction in the early 1980s. So how do they work?
In my town they are replacing all of the traffic lights with these new lights that look like they are made of hundreds of tiny bulbs. Why are they replacing all of the lights?
There is something exotic about the traffic lights that "know" you are there -- the instant you pull up, they change! How do they detect your presence?
A friend of mine just bought a new car and it has a neat security feature. The ignition key has what looks like a microchip embedded in it. The owners manual says that without this chip the engine either will not start or will start and then die immediately. How does this microchip on the key prevent the engine from starting?