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In what country do children get to school by crossing a river on steel cables? Detailed answer

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In what country do children get to school by crossing a river on steel cables?

In some mountainous areas of Colombia, villages, separated from the "mainland" by rivers or other obstacles, are connected to it only by a system of steel cables. They are used by both adults delivering goods to and from the city, and children who need to get to school.

The picture shows a 9-year-old girl riding down a cable at a speed of 65 km / h, while carrying her 5-year-old brother in a bag, who cannot yet ride on his own.

Authors: Jimmy Wales, Larry Sanger

 Random interesting fact from the Great Encyclopedia:

Why did one American mail 80 bricks in small parcels?

The American Postal Service has been offering domestic parcels since 1913. Three years later, a businessman from Vernel, Utah, calculated that this was the cheapest way to deliver building materials over long distances. He sent 676 bricks in small parcels to his city, 80 km away, wrapping each one separately to build a bank. Having completed the order, the postal department immediately set a daily limit of parcels per person at 000 kg.

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Special electrodes for battery operation in cold weather 26.06.2022

It is known that temperatures below the freezing point of water have a very detrimental effect on the basic parameters of lithium-ion batteries. In the context of electric cars and other vehicles, this means shorter travel distances, longer charging times, problems with regenerative braking systems, and more. Therefore, engineers and scientists involved in the development of new batteries pay great attention not only to increasing their capacity, but also to ensuring uninterrupted operation in extreme temperatures.

Some automakers, notably Ford, equip their car batteries with temperature sensors and heaters that keep the battery temperature within acceptable limits. At the same time, part of the battery energy is spent on heating them, which reduces the travel range of an electric car. Other battery manufacturers use special electrolytes that can operate at sub-zero temperatures.

In the same area, there is a group that includes scientists from several Chinese scientific institutions. They conducted research, the results of which showed that one of the vulnerable components of the battery, responsible for the loss of capacity when the temperature drops, is the anode, one of the battery's two electrodes. As a rule, anodes are made of graphite, which has a flat, smooth surface. So Chinese scientists started experimenting with various alternatives and eventually came across a very promising solution.

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Scientists believe that the implementation of the results of their work can significantly expand the functionality of lithium-ion batteries in extreme environmental conditions. And not only electric cars, but also drones for various purposes, spacecraft and much more can benefit from this.

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