Logically, yes, he seems to be absolutely right; while, in fact, not all theories that we are studying are applicable and applied to facts. Students should study for the sake of acquiring knowledge and for the sake of themselves too. This student who asked that quotation needs an extremely explanation in order to get full satisfaction when doing his/ her projects at schools.

If the applicability of the theory could be easily determined apriori, then this question would make sense. In reality, it is impossible to predict which of your scientific tools will prove useful. Sometimes one even wonders how methods, looks as very far turn out to be necessary. Knowledges is opportunity. But these implementation depends on the person. Sometimes, unfortunately, these remain a dead weight. As we say: "This food not for this horse." (Ne v konja korm - Russian).

Many thanks to : Vadim S. Gorshkov , I appreciate and respect this answer.

Currently applied physics can live well with precise descriptions of phenomena that have no proper explanation because proper description usually enables replication. Theoretical physics poses problems because since physics does not start from a trustworthy foundation, it cannot provide explanations for all facets of observed physical reality. This fact struggles with the restriction that not all aspects of the structure and behavior of physical reality are accessible to observation and that includes observation with the aid of the most sophisticated equipment.

This means that as long as theoretical physics has no accepted foundation it has a structural problem to explain the structure and behavior of physical reality.

If a suitable foundation is accepted then it can still be too complicated to deduce the required explanation from the foundation. The deeper one dives, the simpler will be the level of the structure of the model. The foundation itself is very simple. At least the lowest layers of the structure of physical reality will become explainable by the constructed model.

Thank you for your respective answer Sire Hans van Leunen.

you as a student have to study obsolete/superseded theories in order to understand the cause of their falsification, modification, and replacement with new scientific and more objective theories.

Thank you Dear (PhD) Mounya Abdaoui.

I have PhD in economic development , not a student. This question could be asked as a lecturer at the class, Is this your answer? I think The answer is not enough and you should be more convincing .

I think it is better to investigate the restrictions that mathematics poses to physical theories. These restrictions defend against including fantasies into physics. Often fantasies that already crept into physics start their own live and cannot easily be banned out and be replaced by better explanations. Physics is still clattered with these fantasies. Many of these fantasies appear in presentations that are meant to instruct interested people. This is poison to science. Be aware of so-called scientific explanations at YouTube.

In the extreme, only a purely mathematical model can explain physical reality.

Mathematics already contains a hierarchy of structures that emerge from simple foundations and combine to a model that explains much of physical reality. This hierarchy contains lattices, vector spaces, number systems, Hilbert spaces, stochastic processes, function theories, differential calculus, and integral calculus.

Only a theory that founds on a trustworthy foundation can be tested thoroughly.

Currently, mainstream physics does not offer well-founded theories. Instead it maintains many excuses for not supporting a solid foundation. None of these excuses are valid.

Thank you ++ Dr. Hans van Leunen, your analysis is very beautiful, but the mathematical interpretation, what about the social sciences, the human? Notice: I am looking for the most compelling answer for the student.

My comments are focussed on the exact sciences. Social and economical sciences must be focussed on the welfare of communities.

Humans are creatures at the top of the modular designed set of modules and modular systems that start with elementary particles as elementary modules. Modular design is most successful when intelligent module communities take take care of their module community and also take care of the module communities on which they depend. In particular, they must care for their living environment. The community survives the individual. Darwin's phrase that the fittest individual will survive is pertinently false. It can easily disturb the interest of the community.

Thank you so much +++Dr. Hans van Leunen for very clever answer which is: " In particular, they must care for their living environment. The community survives the individual. Darwin's phrase that the fittest individual will survive is pertinently false. It can easily disturb the interest of the community".

Modular design is an essential characteristic of physical reality. Not all elementary particles take part in the modular construction process. For example bosons do no play an essential role, but instead fermions constitute all other massive objects in the universe with the exception of black holes.

My vision on physical reality is published in "A Self-creative Model of Physical Reality"; http://vixra.org/abs/1908.0223

Logically, yes, he seems to be absolutely right; while, in fact, not all theories that we are studying are applicable and applied to facts. Students should study for the sake of acquiring knowledge and for the sake of themselves too. This student who asked that quotation needs an extremely explanation in order to get full satisfaction when doing his/ her projects at schools.

Thank you Dr. Anastas Ivanov Ivanov : Your description is very excellent, I respect and appreciate your answer.

Thank you very much Dr. Murtada Al Manifi for this clarification and acceptance of the opinion of the student, but we as teachers need to convincing answer to the students.

For instance, try to give the following information to that student, and then ask him his question again;

The Blue Angels

Discuss: In 1946, the US Navy's Flight Demonstration Squadron, popularly known as the Blue Angels, performed for the first time. Intended to enhance Navy recruiting and to represent American armed forces as international ambassadors of good will, the Blue Angels perform aerial demonstrations involving highly precise maneuvers while flying in formation. During the stunts, the jets can sometimes come within 18 inches of each other. Why is it that pilots in the Blue Angels squadron do not wear G-suits?

All the best dear sir!

Thanks for your vivid examples and recommendations!

Dear++ Dr. Murtada Al Manifi :

I liked the speed of the response, and the example you gave. Thank you very much.

There is a very interesting discipline called "History of science". There is a book by Thomas Kuhn: the Structure of scientific revolutions. To know the history of scientific thought is very interesting and instructive.

Thank you very much Dr. Eugene Veniaminovich Lutsenko for you advice this book will be helpful.

Students being trained in engineering and applied scientific fields should thorough study theories being currently practically used/applied in those particular fields. On the other hand, student specializing in natural sciences should definitely to be studying advanced theoretical developments that are currently being at the scientific frontiers, as they are the second echelon to widen those frontiers in the neat future.

Thank you so much for your answer Dr. Len Leonid Mizrah .

Whether obsolete or up to date the theory under study is, studying it critically and knowing thoroughly its applicability or why it has become no longer applicable is a an invaluable training exercise for the student, in science as well as in logic.

Many thanks to Professor Dr. Atheel Jomard for this excellent answer

In science, a theory is superseded or becomes obsolete when a scientific consensus once widely accepted it, but current science considers it an inadequate, incomplete, or simply false description of reality. Such labels do not cover protoscientific or fringe science theories that have never had broad support within the scientific community. Furthermore, superseded or obsolete theories exclude theories that were never widely accepted by the scientific community. Some theories that were only supported under specific political authorities, such as Lysenkoism, may also be described as obsolete or superseded.

Many thanks Qusay Abdullah Abed .