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This is the sort of idea that can be a) dangerous in the hands of the ignorant b) even more dangerous in the hands of "I fucking love science!" type moron cheerleaders c) incredibly powerful if you've actually done the work to understand how things like absorption spectra work
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For example, how can a telescope measure the composition of the planets orbiting a distant sun? How can we be sure of it? Solipsism and Cartesian skepticism allows us to draw boundaries and conditions on the degree to which we can rely on scientific instruments.
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