How Does Electricity Travel Through a Wire?
Electricity comes into our buildings on copper or aluminum wires from giant electric generators in power stations. The electric current produced is a moving stream of...
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How Does an Electric Eel Produce Its Electricity?
Electric eels are not actually eels at all. They’re a specific kind of knife fish that lives mainly in bodies of fresh water in South America, such as the Amazon...
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When Were Traffic Lights First Used?
You may think that the familiar red-green, traffic signal is a product of the automotive age. But actually, the first traffic signal was erected in 1868, in London, to...
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