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Teaching couldn't take place if you didn't believe something before it was demonstrated to be true...
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This can also be described as making inferences, that is, making statements/predictions about what you can not detect, on the basis of what you can -- Neptune was predicted before later astronomers were able to directly observe it. More broadly this can also be called theory, and it is a key aspect of the scientific method; but observation/recording comes first, and is the basis of subsequent hypotheses made in the scientific community.