What Is The Definition Of Science?
Editor: Iftakhar Hossain Simanto
Science is such knowledge or such a system of knowledge that is concerned with the physical world and its phenomena and that entails unbiased observations and systematic experimentation.
According to Professor James Ladyman of the University of Bristol
We may not yet know how to define science or how to tell whether certain contentious activities or beliefs count as scientific or not, but we certainly have lots of example of Science. Understanding philosophy of science; Page no: 4
In response to the question of what science is, Professor Mikhela Massimi of the University of Edinburgh said;
Science is just what people who are professional scientists do. Philosophy and the Sciences for Everyone by Professor Mikhela Masimi; Page no:1
In response to the question of what science is, Clark Larsen, a professor at Ohio State University, said:
Manuel Moles, an emeritus professor at the University of New Mexico, said in response to a question about what science is.
Broadly speaking, science is a way of obtaining knowledge about the natural world using certain formal procedures.Ecology: Concepts and Applications; by Manuel Molles
Although Philosopher Samir Okasha doesn’t try to define science except talks about distinctive features. Introduction to the philosophy of science by samir okasha chapter 2
Scientists at the National Academy of Sciences have highlighted some of the important features of science;
Science is a way of knowing about the natural world. It is limited to explaining the natural world through natural causes. Science can say nothing about the supernatural. Whether God exists or not is a question about which science is neutral. Teaching About Evolution and the Nature of Science |The National Academies Press
what is the scientific method
Everything in the physical world is observable, testable and verifiable, and its research and its results are science.
Science does not discuss what is not physical, not observable and measurable. For example, our human body is a physical object. So science discusses the human body. But the beauty of our body is not material. So science does not discuss beauty. There is a separate scripture called “Aesthetic” to discuss beauty. Similarly, science does not discuss our mind, morality, values, existence of creator, soul, afterlife etc. Metaphysics discusses these topics.
Science will first present a hypothesis by observing something and then present a theory by examining that hypothesis step by step. The theory can be tested, verified at any time.
Can science give certain knowledge?
No other branch of knowledge can impart more knowledge about physical subjects than science. But science can never give us certain knowledge.
The Stanford Encyclopedia of Philosophy states,
Scientific theories have a definite term. A closer look at the history of science reveals many once influential and accepted theories that are being taught in the history of science today. That is, they are no longer acceptable. Realism and Theory Change in Science (Stanford Encyclopedia of Philosophy)
The philosopher Carl Papper said,
Scientific knowledge is created to find the truth, but remember, it is not a search for certainty. All human knowledge is erroneous, so uncertain. https://www.routledge.com/In-Search-of-a-Better-World-Lectures-and-Essays-from-Thirty-Years/Popper/p/book/9780415135481
Psychologist Keith Stanovich says that;
science has always been proving falsehoods. Amazon – How to Think Straight About Psychology (10th Edition): Stanovich, Keith E.: 9780205914128: Books
We can take Newton’s theory as an example. Newton’s theory lasted for two hundred years in the field of science. From these two hundred years of science worship, even ordinary people have accepted this theory as true. But Albert Einstein questioned Newton’s theory.
Why can’t science give certain knowledge?
1.The problem of induction
Scottish Philosopher David Hume(1711-1776) made a distinction between relations of ideas and matters of fact. Relations of ideas are for example a horse is an animal and matters of fact- for example, Dhaka is the capital of Bangladesh. You can have false propositions also. For example- “Whale is a fish” (relations of ideas) and “David Hume died in 1774”(matters of fact).
He tried to explain that “relations of ideas” can be deduced. On the contrary, you need to have empirical evidence to support “matters of fact”. Hence philosophers like David Hume, John Locke, George Barkeley denied a priori knowledge.
So, anyway what David Hume is trying to convey to us is that you can’t make decisions based on purely a priori knowledge. Imagine you have always seen that whenever it is night the light turns on. So the cause is “night” and the effect is “light turns on”. But one night you saw that the light never turned on. Although the battery or the electricity all are 100% fine. But what’s the problem? Maybe because the agency felt not to turn the light on for today or something else. But your expectation was whatever happened in the past; will happen now and in the future.
Let me give you another example. Suppose a gunpowder and explosion. You know the relation between these 2 causes and effects. Now in the past you saw gunpowder cause the explosion. But in the future it doesn’t.
Or suppose you always have known for a fact that in all physical objects there are atoms, electrons, protons etc. But have you observed every single object to make this kind of inference? If not, then you will face “the problem of induction”. Understanding philosophy of science by ladyman page 32 
The problem with induction is that the scientific theory will change as the power of observation increases. For example, Until the 18th century in Europe, it was thought that all swans on earth were white. Because until then, all the swans we observed were white. But in 1896, William the Blaming discovered the Black swans in Australia. In this way (All swans are white and have always been white) this theory is proved wrong. So, with the increase in the power of observation, the scientific theory will change. This is the problem of induction.
2. Scatter graph problem
The scatter graph problem is that multiple conclusions can be drawn from the same observation. For example, We have 100 points. This is the information. If we are asked to draw conclusions from this information, it will be seen that someone has drawn a straight line with these. Someone has drawn a curve. Someone has made triangles, quadrilaterals, squares. That is, the same observations and information hold the potential for many theories. As a result, the theory can never reach our definitive knowledge. This is the scatter graph problem.
Renowned physicist Freeman Dyson wrote in an article in the New York Review,
“Public The public has a distorted view of science, because children are taught in school that science is a collection of firmly established truths. In fact, science is not a collection of truths. It is a continuing exploration of mysteries ❞ meaning, “People have a distorted view of science. Children are taught in school that science is a combination of well-established truths! In fact, science is not a ‘collection of truth’. Science is a continuous mystery. ”“ Science is not a collection of Truths ”How We Know | Freeman Dyson | The New York Review of Books (nybooks.com)
Does science discuss God or supernatural things?
Science deals with anything that can be observed, tested and verified in the physical world. Science does not discuss our minds, morals, values, the existence of the Creator, the soul, the afterlife, etc. Because these are not observable, testable and verifiable. Metaphysics discusses these topics. .
Alex Filippenko, a member of the 2011 Nobel Prize-winning team for discovering the concept of dark energy, told RT News:
I want to discuss the universe from a scientist’s point of view. I can’t say whether there is a superhuman or self-creator or whether there is a purpose to this universe. Science cannot answer these questions.https://www.rt.com/news/universe-physics-laws-energy-329/