What do the colored rings on the Olympic flag mean? Detailed answer

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What do the colored rings on the Olympic flag mean? Detailed answer

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What do the colored rings on the Olympic flag mean?

Intertwined multi-colored rings on the white cloth of the Olympic flag - from left to right: blue, black, red (top row), yellow and green (bottom row) colors - should symbolize the unification of all continents in the Olympic movement. By tradition, the blue ring symbolizes Europe, the yellow one - Asia, the black one - Africa, the green one - Australia, the red one - America.

Such a flag was proposed by Baron Pierre de Coubertin, the founder of the modern Olympic Games, combining the colors of all national flags on it.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Do moths fly to flames?

They are not attracted to him at all. It just confuses them.

With the exception of forest fires, artificial light sources have existed on Earth for a very short time compared to the age of the relationship between moths and the Sun with the Moon. Many insects use these natural light sources to navigate both during the day and at night.

Since the Moon and the Sun are very, very far away, as a result of evolution, insects have become accustomed to the fact that light should hit their eyes in the same place at different times of the day or night. This allows them to calculate the flight in a straight line.

When people show up with their portable mini-suns and mini-moons, the light confuses the insect. It believes that it is moving along a curved path, because its position relative to the stationary "moon" or "sun" has somehow suddenly changed.

The moth begins to adjust its course until it again sees the light as stationary. When the light source is this close, the only possibility for the object next to it is to endlessly cut circles.

By the way, moths (in fact, the same moth) do not eat clothes. (Their caterpillars do this.)

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Converting coal to anode grade graphite 13.01.2021

American scientists have succeeded in turning raw carbon powder into nanographite, which is used in lithium-ion batteries.

The coal industry can radically change its mission from environmentally dirty combustion in the furnaces of thermal power plants to an element necessary for creating "green" energy accumulators. Scientists have successfully converted raw carbon powder into nanographite, which is used in lithium-ion batteries, among other things.

Previous research has shown that microwaves can be used to reduce the moisture content of coal and remove sulfur and other minerals, but in this latest experiment, the only treatment needed was to grind raw coal from the Powder River Basin in Wyoming into powder.

During the experiment, charcoal powder was placed on copper foil and sealed in glass containers with a gas mixture of argon and hydrogen before being placed in a microwave oven. Then high temperatures, copper foil and gas turned the coal powder into polycrystalline graphite.

The current production of 99,99% pure anode grade graphite is expensive and the process generates toxic waste. The final cost is not so much the material as the cleaning process.

One lithium-ion battery in an electric car uses about 25 kg of pure graphite to create an anode.

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