Constantly acting noise dulls the hearing, tires the nervous system, reduces the human performance. Absolute silence is just as harmful to humans as loud noise. The room is considered noise-free if the noise level ranges from 20 to 40 decibels (dB). The nature of the noise also matters: high tones are worse than low tones. Every person needs to know and remember about this. You need to take care not only about yourself, but also about the health and tranquility of others. A well-educated person will not talk loudly in public places, turn on the radio, TV or tape recorder at full power.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.