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HOW DOES A LIE DETECTOR WORK? The device for detecting a lie is one of the tools in a criminal investigation and is used by the police in many countries. However, the data obtained...
HOW IS ELECTRICITY GENERATED IN A POWER STATION? When you’re traveling by train or riding along in a bus or car, you can easily spot a power station if you pass one. Many power stations have very tal...
What is Resonance? Materials have a quality that produces a very useful result, called resonance, and it is one of the things that gives added effect to a speaker's voic...
Homemade Corn Sheller Where there is but a small quantity of corn to be shelled a sheller can be made of a few scraps of wood usually found on a farm. A block of wood havin...
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