Why is the sound of the sea heard in the souvenir shell? Detailed answer

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Why is the sound of the sea heard in the souvenir shell? Detailed answer

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Why is the sound of the sea heard in the souvenir shell?

The "Sound of the Sea" in a souvenir seashell is actually environmental noise resonating with the cavities of the shell. A similar effect can be achieved without a souvenir by putting a mug or a bent palm to the ear. In addition to sounds from outside, the resonator can amplify

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

When did ballet appear?

What is ballet? This is a type of theatrical performance that combines several things: dance, scenery and music. Some ballets have a plot, others simply reflect an idea or mood. When you watch a ballet, you see the human body take on the most elegant and harmonious poses. All this requires long intense training of dancers in order to look natural and beautiful during the performance.

Ballet is about 500 years old. It originated in Italy at the time when Columbus was discovering America. But it was completely different from today's ballet. In those days, ballet was a form of palace entertainment. Italian aristocrats entertained themselves and their guests with performances that combined dance, music, pantomime, poetry and drama. Thus, the first ballet dancers were royalty and titled persons, and there were no professional dancers.

The dance steps were taken from the elegant but rather simple court dances of the time, and the dancers did not wear dancing shoes. However, such dances were not called ballet until the reign of King Henry III of France.

In 1581, Queen Catherine de Medici ordered grandiose celebrations in honor of the royal wedding. A breathtaking ballet was put on with hundreds of dancers, singers and actors. It was choreographed by the Italian musician Beaujuol. He was probably the first choreographer or dance director. Beaujouol called his work "Royal Comic Ballet", and since then performances of this kind have been called ballets.

The lead dancer in a ballet group is called a prima ballerina. The first prima ballerina was La Fontaine, who danced in 1681.

Later, various changes and improvements were made to the ballet.

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Random news from the Archive

Women find it harder to quit drugs 14.02.2015

It is known that drug dependence in women develops faster than in men, and the likelihood of relapse after drug treatment in women is also higher. The neurobiological reasons for this were found out by researchers from the Weill Cornell Medical College at Cornell University (USA). Although the experiments were performed on rats, there is every reason to believe that here we are dealing with a fairly universal property of the nervous system and that the results obtained are quite applicable to humans.

Addiction to drugs in women is more severe, perhaps not least because of the way the brain's opioid receptors work.

The development of addiction is associated with the associative work of the nervous system. Of course, the ability to form associations is a very useful property, however, when it comes to narcotic substances, associations appear where they are not needed. It turned out that in female rats, parts of the hippocampus associated with associative connections work differently than in males. (The hippocampus is one of the main memory centers in the brain, and it goes without saying that associative thinking cannot do without it.) In females, the female sex hormone estrogen exerted the strongest influence on the work of associative neurons. The more it was (and the level of estrogen fluctuates during the menstrual cycle), the stronger the synapses between neurons were, the stronger the nerve cells were connected to each other, and there were no obstacles to conduct a nerve impulse.

The opioid receptor system played an important role in strengthening interneuronal connections under the influence of estrogen. In an article in the Journal of Neuroscience, the authors write that one of them, the mu receptor, maintains background neuronal activity in females, but not in males. Another, called the delta receptor, stimulates long-term potentiation, that is, it helps keep the synapse in working order even after the original stimulus has disappeared. Under the influence of estrogen, the number of delta receptors in females became three times greater than in males.

Opioid receptors work when you need to calm down, relieve mental and physiological excitement, reduce pain, create a feeling of euphoria. To turn them on, there are endogenous opioids produced by the body itself. If opioids begin to come from outside in the form of some kind of drug, then as a result a strong neural circuit is formed, which will remember the pleasant sensations associated with taking the substance. And since opioid receptors affect the activity of associative pathways, then all kinds of associations will be tied to a narcotic sensation. In the female nervous system, all these connections will be stronger thanks to estrogen.

The results obtained may be useful not only in the treatment of drug addiction. Many modern pain medications that work with the opioid system act on the mu receptors, and although such drugs are effective in relieving pain, they, alas, can also be addictive and addictive. The authors of the work believe that it is possible to create other analgesics that will have a special effect on delta receptors without threatening the patient with drug addiction.

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