What the theory of long-range action claimed; short-range theory?

The theory of action at a distance asserted that the action of one body on another occurs instantly. The theory of short-range action asserted that the action of one body on another cannot happen instantly. The finiteness of the speed with which the electromagnetic field propagates is its fundamental property.

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.