Thus, by science I mean, first of all, a worldview giving primacy to reason and observation and a methodology aimed at acquiring accurate knowledge of the natural and social world. This methodology is characterized, above all else, by the critical spirit: namely, the commitment to the incessant testing of assertions through observations and/or experiments – the more stringent the tests, the better – and to revising or discarding those theories that fail the test. One corollary of the critical spirit is fallibilism: namely, the understanding that all our empirical knowledge is tentative, incomplete and open to revision in the light of new evidence or cogent new arguments (though, of course, the most well-established aspects of scientific knowledge are unlikely to be discarded entirely).. I stress that my use of the term 'science' is not limited to the natural sciences, but includes investigations aimed at acquiring accurate knowledge of factual matters relating to any aspect of the world by using rational empirical methods analogous to those employed in the natural sciences. (Please note the limitation to questions of fact. I intentionally exclude from my purview questions of ethics, aesthetics, ultimate purpose, and so forth.) Thus, 'science' (as I use the term) is routinely practiced not only by physicists, chemists and biologists, but also by historians, detectives, plumbers and indeed all human beings in (some aspects of) our daily lives. (Of course, the fact that we all practice science from time to time does not mean that we all practice it equally well, or that we practice it equally well in all areas of our lives.) . Alan Sokal
About This Quote

The reason why the quote says that by science I mean first of all is because science is not limited to the natural sciences. Science can also be used to help people understand crimes, political issues, economics, psychology, finance, and many other aspects of our lives. The quote says that by science I mean first of all because science is critical. Science is only as good as the evidence that it has.

To be good at science you have to be able to test your ideas. If it works it's good, if it doesn't work it's not good. If something cannot be proved or disproved then it isn't science.

This quote explains how critical thinking is important for scientists to use when they are doing their work.

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