Where and when did you start renting cars? Detailed answer

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Where and when did you start renting cars? Detailed answer

Big encyclopedia for children and adults

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Where and when did you start renting cars?

For three francs an hour, or 30 francs a day, in January 1896, one of the six cars, including a driver, could be hired from the Paris Automobile Club.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Why do bubbles in Guinness beer move down instead of up?

In Guinness beer, you can clearly see how the bubbles go down the walls of the glass instead of going up. This is due to the fact that in the central part of the glass, the bubbles rise rapidly, pushing the liquid down at the edges with stronger viscous friction. But this effect is typical not only for Guinness, but in general for any liquid, it is just more noticeable in this beer. This is primarily due to the fact that instead of carbon dioxide, Guinness is filled with nitrogen, which is less soluble in water. Secondly, light bubbles are simply more visible against a very dark beer.

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Breathing easier in the Carboniferous 10.06.2000

Why aren't there ants the size of dogs? Because insects do not have lungs in which the blood is saturated with oxygen, and then carries it throughout the body.

Insects are supplied with oxygen by "forced ventilation": thin air tubes-tracheas fit all organs, and even individual cells. Of these, oxygen diffuses into the tissues. This inefficient way of breathing prevents insects from becoming larger than 10-15 centimeters.

However, the imprints of giant dragonflies in coal seams have long been known. Their wingspan was 50-70 centimeters, like a fairly large aircraft model. How could such giants breathe? Robert Berner of Yale University measured the content of certain carbon and sulfur isotopes in Carboniferous deposits. The accumulation of these isotopes depends on the concentration of oxygen in the air.

According to Berner's calculations, 250-350 million years ago, the Earth's atmosphere contained 35 percent oxygen instead of the current 21 percent. Therefore, huge insects could exist.

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