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What invention lets you look...

What invention lets you look right through a wall?

Correct answers: 77

The first user who solved this task is Roxana zavari.

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Pilot: Have you ever flown in ...

Pilot: Have you ever flown in a small plane before?

Passenger: No, I have not.

Pilot: Well, here is some chewing gum. It will help to keep your ears from popping.

Pilot (after the plane landed): Did the gum help?

Passenger: Yep. It worked fine. The only trouble is I cant get the gum out of my ears.

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Tidal power

In 1966, President Charles de Gaulle opened the world's first tidal power station at Rance estuary, in Brittany. La Rance is the most powerful tidal power plant in the world. With its width of 700 metres, it blocks La Rance estuary situated near Saint-Malo (Côtes d'Armor). The operation of the dam is similar to that of run-of-river power plants since its head is also low and there is a substantial flow rate. At high and low tide, the water builds up rapidly on one of the sides of the dam. When the difference in level is sufficient, the gates are opened and the water rushes into the dam. The turbines are reversible so as to be able to operate regardless of the direction of water flow. Each year, the power plant generates 500 million kWh.

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