People have long used the different ability of bodies to absorb radiation energy, for example, kettles and pots are produced with a mirror surface (then they emit less heat), the surface of airplanes and helicopters is painted with silver paint so that they are less heated by the sun (they reflect heat better).
A dark surface absorbs light better than a light one. Therefore, in hot weather, light-colored clothing is usually worn.
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.