What types of radiation affected you in the past day?

Usually, during the day, a person is exposed to thermal radiation from the Sun and incandescent lamps; electroluminescent, if the house has fluorescent lamps: cathodoluminescent, if he is watching television with a cathode ray tube.

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.