Why can't people breathe and swallow at the same time? Detailed answer

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Why can't people breathe and swallow at the same time? Detailed answer

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Why can't people breathe and swallow at the same time?

The human voice apparatus gives him the ability to speak, which is different from all other animals. At the same time, its complex structure does not allow humans, unlike animals, to breathe and swallow at the same time. Although newborn babies can do this, they don't do it until around 9 months of age, when the larynx begins to descend.

Authors: Jimmy Wales, Larry Sanger

Random interesting fact from the Great Encyclopedia:

Who Invented Matches?

The human desire to learn how to make fire in order to heat oneself and cook food, forced to invent various types of "matches". The caveman struck sparks from flint and hoped that this would ignite the dry leaves. The Romans, thousands of years later, did not advance much in the way they made fire. They banged stone against stone and with a carved spark tried to set fire to a torch covered with sulfur.

In the Middle Ages, they tried to set fire to dry rags or dry moss with sparks carved with flint and iron. Such materials, which are highly flammable, are called "wick".

Modern matches were invented with the discovery of phosphorus, a substance that ignites at very low temperatures. In 1681, an Englishman named Robert Boyle dipped a splinter that was coated in sulfur into a solution of sulfur and phosphorus. This is how matches were born. But they ignited so easily that this invention was not practical.

The first practical matches were made in England by an apothecary named John Walker. In order to light them, it was necessary to strike them between the folds of paper, on which crushed glass was applied. By 1833, phosphorus matches that could be ignited by friction appeared in Austria and Germany. But there was one problem. White or yellow phosphorus was so dangerous to matchmakers that it had to be banned by an international treaty in 1906.

Eventually the non-toxic red phosphorus came into use in production, and this led to the invention of safety matches. The first safety matches, which were lit only on a specially treated surface, were made in Sweden in 1844. Instead of applying all the necessary chemical components to the match head, red phosphorus was applied to the surface of the box on which the matches were lit. Such matches were harmless as long as they did not come into contact with the "striking" surface.

During the Second World War, some troops were sent to the tropics on the Pacific coast, where very frequent rains made simple matches ineffective. A man named Raymond Cudi invented a coating for matches that kept them working even after 8 hours of being under water!

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Random news from the Archive

Chemical composition of Viking weapons 14.03.2022

A group of scientists from the University of Nottingham attended to the study of the chemical composition of the metals from which the Viking weapons were made. This will allow specialists to determine its origin. The results of the study will help historians better understand the important events that changed the course of English history.

According to a report from the University of Nottingham, experts are examining 90 Viking Age metal artifacts found at various times throughout England. Historians will examine weapons used by Scandinavian invaders at the Battles of Fulford in North Yorkshire and Babynington Heath, weapons from the Viking camp at Torksey in Lincolnshire, and artifacts found at the former Viking seaport of Meols.

The weapons of the Vikings helped them in the conquest of various territories in Britain. No matter how many times the Vikings were defeated, from AD 793, when they first landed in Britain, until AD 1066, when William the Conqueror became King of England, they showed amazing tenacity and always achieved their goals.

The Battle of Fulford on September 20, 1066 was one of the last clashes between the Anglo-Saxon and Scandinavian troops: then the Vikings defeated the English troops, but were themselves defeated five days later at the Battle of Stamford Bridge on September 25, 1066. The Battle of Hastings on October 14, 1066 was the final defeat of the Anglo-Saxons.

According to researchers, during the break between the two battles in September 1066, the Vikings set up mobile iron processing stations in the Fulford camp, which they had to abandon after the defeat at Stamford. Most of the weapons that the University of Nottingham research group is studying were produced during this period.

The scientists plan to determine the chemical isotopic signature of the metal in Viking weapons by analyzing iron, lead and strontium isotopes. Lead isotope analysis has already been successfully used to determine the origin of ancient silver and copper metal artifacts.

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