Common Sense is our chief survival mechanism. It has seen us through a billion years of Evolution. Without it any organism would quickly go under. Watch any wild animal, even birds in your garden. They are constantly having to weigh the Odds of Opportunity versus Risk — and when they get it wrong they die.

Making decisions wisely will dictate the course of our lives: how we make a living, who to marry, where to live, how to raise our kids…… But how do we decide? Almost entirely by using Common Sense. But how does it work? They certainly don’t teach us at school or university. You might say: “But they don’t need to, we inherit Common Sense with our genes”. True enough, but today we live in such a changed world from our hairy ancestors that to apply Common Sense Thinking (CST) to it we need to understand exactly how it works. That means we have to learn concepts such as Bayes’ Gambling Rule, Categorical Inference and the Principle of Animal Wisdom (PAW)….., as anyone over the age of 14 could.

There is no room here to explain how CST works but if we look at some few of its manifold implications that might encourage readers to dig deeper:

(1) Philosophers don’t understand serious thinking — they never have. For instance the Ancient Greeks thought it was based on Deduction which, as one can demonstrate, it cannot be.

(2) If CST is an inherited survival mechanism, and we share 98 percent of our genes with chimpanzees, how come we can launch telescopes into Space while they are still struggling to crack nuts in the jungle?

(3) It turns out that, because of an invention made about three thousand years ago near Byblos in Asia Minor, humans have multiplied their capacity to use Common Sense a million-fold .

(4) If that is so, does that mean that some other animals might be, genetically speaking, just as smart as us? Very probably yes. For instance Sulphur Crested Cockatoos have solved the Population Control Problem, which seems to be alas, entirely beyond us.

(5) All serious thinking turns out to be provisional. One’s conclusions can always be overturned by new evidence. Thus Certainty is unattainable in the real world! This has profound moral, philosophical and historical consequences. All civilisation and progress must rest on provisionality, and thus tolerance.

(6) It is possible to demonstrate, using CST, that even small amounts of dishonesty can fatally handicap any agent involved in a competitive situation, be it an individual in society, a firm in business, or a nation at war. ‘Nice guys come in last’ is complete nonsense. In the long run ‘Honest chaps will come in first’.

(7) The secret of Science’s success is not just Logic, Mathematics, Experiment or superior evidence; it is CST.

(8) Not all subjects are amenable to the scientific approach enabled by CST. For instance Economics and Psychology can never become sciences and are mostly hocus-pocus capable, like witch-doctory, of inflicting considerable harm. For instance the case for Free Trade, beloved of Economists, is , as one can show using CST, arrant nonsense. Indeed half-baked economics is the cause of much misery, including mass employment.

Those who would like to get to the bottom of Common Sense Thinking could read my paperback ‘Thinking For Ourselves’ [Amazon, 2020, 605pp, £14:50. There are exercises with answers on this site as well as stuff about the book in the ‘my books’ category] .Meanwhile there is more about the History of Thinking which you can download from:

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