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Neil deGrasse Tyson - If you want to assert a truth,...
If you want to assert a truth, first make sure it's not just an opinion that you desperately want to be true. (Neil deGrasse Tyson)

If you want to assert a truth, first make sure it's not just an opinion that you desperately want to be true.

Neil deGrasse Tyson

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assert opinion sure truth

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