In calm weather, the smoke from the chimney of the building rises vertically, and from the chimney of a moving steam locomotive it spreads over the train. Why?
Above the stationary chimney of the building, in the same place, there is a convection flow of warm air that rises upward. The pipe of a moving steam locomotive throws out warm air on different sections of the road, which rises very slowly upward. When the train moves quickly, smoke spreads over it.
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.