New discoveries have changed the old mechanistic picture of the world. The world turned out to be much more complicated than anticipated; previously obvious truths were called into question. Matter now consisted of infinitely complex atoms. The light did not propagate “ether”, but electromagnetic waves. Quantum theory has destroyed previous ideas about the continuity of natural processes. Even time and space, seemingly so obvious, were reinterpreted by the theory of relativity.
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.