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For example , that a bird sings because it is happy is not a testable hypothesis , since we have no way to measure the happiness of a bird . We must ask a different question , perhaps about the brain state of the bird , since this can be measured . In general , science deals only with matter and energy , that is , those things that can be measured , and it can not arrive at knowledge about values and morality . This is one reason why our scientific understanding of the mind is so limited , since thoughts , at least as we experience them , are neither matter nor energy . The scientific method is also a form of empiricism .
Please check all the words that can be used instead of the target word in the same context. Note that the morphology of the target (third person singular, past tense etc.) is considered to be applied to the candidate automatically in the process of paraphrasing.