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 using this…

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HOW IS GEOTHERMAL ENERGY PRODUCED?

Do you know what it is like at the center of the earth? It is very, very hot. The temperature is thought to be about 13,000 °F (7000 °C), which…

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HOW DOES TIDAL POWER WORK?

Have you ever watched the sea during a storm? The waves crash down with enormous energy. Sometimes they are strong enough to damage seaside walls and buildings, or even make…

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How bicycle pump works?

When you pump up your bicycle tires or football, you are making use of compressed air.Inside a bicycle pump is a small device called a valve.A valve allows a gas…

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