Here is an excellent video by Stephen Fry about different ways by which people claim to “know” what’s true. He talks bout scientific method: formulating a hypothesis, conducting experiments, and testing the results against the theory. Other people claim to know things by visions, or the contents of holy books written thousands of years ago. Some of these claim that the sun revolves around the earth, which we now know to be false. Have a look at Fry’s arguments for science as the best way of discovering knowledge about the real world.
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