Observation precedes experiment. Observing, there is a need to explain the observed. A person has a hypothesis, which requires confirmation. To find the true cause of the phenomenon, scientists conduct experiments. Repeatedly confirmed hypothesis turns a proven regularity and later into a theory – the main content of scientific thought.
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.