It is the mark of an educated mind to be able to entertain a thought without accepting it ~ Aristotle[1], circa 350 BCE. I like to conduct thought experiments because they are useful to understand how people think. But, almost always, I am disappointed because people get defensive and refuse to engage. Perfectly understandable and often frustrating, but it does not faze me, I'll keep trying. One way to conduct a thought experiment is to use a hypothetical situation. A key requirement for such is that the participant provisionally accepts the premise(s) and then reasons out the rest. Albert Einstein used thought experiments a lot. They were useful to him to explain complex phenomena and to gain insight into them. His book, Relativity , is filled with such. As an example, they shed light on how the same object falling from a moving train appears to take a different path depending on whether the observer is watching from the stationary platform, or from the t...
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