Why is the diameter of the arena in any modern circus 13 meters? Detailed answer

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Why is the diameter of the arena in any modern circus 13 meters? Detailed answer

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Why is the diameter of the arena in any modern circus 13 meters?

The circus in its modern form appeared in the 18th century, and the Englishman Philip Astley is considered its "father". It was he who empirically established that it is most convenient for horses to run in a full gallop in a circle with a diameter of 13 meters. This diameter of the arena is observed today in most circuses in the world.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

How does a chameleon catch prey?

The body of the chameleon is flattened laterally, the tail is twisted in a spiral and can cling tightly to branches. Fingers are also adapted to this. The eyes of a chameleon can look independently in different directions, for example, one - up, the other - back. This allows the animal to inspect the surroundings, remaining completely motionless, which is very important for him.

The chameleon is able to quickly change color to match the color of the surrounding background. But he doesn't know how to move fast. Only a patient person can notice how he moves.

The fact is that the chameleon does not run after prey, he waits for her to come to him herself. If she's not close enough, he takes a few slow steps towards her. And as soon as the insect is within reach ... of its tongue, it immediately falls into its mouth, before you have time to blink an eye.

The length of the chameleon's tongue can exceed the length of the body, and it straightens out in hundredths of a second. Not only is the tongue sticky, but also its forked tip grabs the victim, like with tweezers. When a chameleon approaches a prey, it may look at it with one eye, while the other may rummage around. But before throwing out the tongue, the lizard directs both eyes at the prey - apparently in order to accurately aim.

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