What is a lie detector? Detailed answer

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What is a lie detector? Detailed answer

Big encyclopedia for children and adults

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What is a lie detector?

A lie detector, or polygraph, is a device that, based on the analysis of changes in blood pressure, pulse, respiratory rate, motor activity and other parameters of the subject at the time when he answers questions, makes it possible to determine with a very high probability whether a person is lying or talking the truth.

However, scientists believe that 90% of the result does not depend on the polygraph, but on the polygraph examiner - a person who draws conclusions based on the readings of the device.

Author: Mendeleev V.A.

Random interesting fact from the Great Encyclopedia:

Why do our teeth decay?

In protozoa, teeth are replaced throughout life. As soon as the teeth wear out and fall out, others immediately grow in their place. A person has only one replacement of teeth. Children by the age of two have only 20 teeth, called milk teeth. Under the milk teeth are the second teeth, which begin to erupt by the age of six. These milk teeth are replaced by the age of 12.

An adult should have a full set of teeth - 32 molars. After that, we can no longer grow new teeth, so the teeth must be monitored to avoid their destruction. Usually the enamel starts to break down. You can see how defects appear on the enamel. It may just be a small hole. But the bacteria that are always present in our mouths soon break down the surface of the enamel and settle underneath. Bacteria do not eat enamel, but they can feed on dentin and lymph, which is located in the channels of the dentin. Subsequently, bacteria corrode the walls of the channels, and a crack forms in the enamel. It may not be noticeable for some time.

But if the bacteria undermine the tooth so much that the walls are too thin, we will find out about this very quickly. This will happen due to the fact that hot or cold will be able to penetrate through the hole into the pulp. The pulp occupies the free space in the center of the tooth and contains the nerves. These nerves are excited by exposure to cold or hot.

When the teeth become sensitive to cold or hot, this means that decay has taken place. When bacteria enter the pulp through the tubules of the dentin, they find an abundance of food and breeding ground there. So we experience a toothache that causes a lot of inconvenience, it is impossible to eat anything, there is no strength to endure. The shell of the tooth begins to die. Moral - go to the dentist more often!

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