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Gasoline: How does the filling gun know that the gas tank is full?

Gasoline vapors are explosive, and their concentration in the filler cap of the car is maximum. The fuse of the filling gun works on pure mechanics.

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Toy yo-yo

Yo-yo is a toy consisting of two disks of the same size and weight, fastened together with an axis, on which the rope is put on by a loop.

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How to check the smartphones on originality?

The problem of fake and non-original smartphones is relevant and requires the attention of potential buyers. Today it became difficult to recognize them.

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