At present, night vision devices have been created, for example, binoculars, optical sights, which convert an infrared image of an object invisible to the eye into a visible one. Such devices allow observation in conditions of insufficient illumination or complete darkness.
In industry, infrared radiation is used to dry and heat materials. Ultraviolet radiation is used in medicine.
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.