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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?
Statistics show that airbags reduce the risk of dying in a head-on crash by 30 percent. Learn the science behind the airbag, what its problems are and where the research is heading.