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|Description=An A physical object or system is an epistemic tool for an [[Epistemic Agent|epistemic agent]] ''iff'' there is a procedure by which the tool can provide an acceptable source of knowledge for answering some [[Question|question]] under the employed [[Method|method]] of that agent. Examples of epistemic tools include rulers, thermometers, the Large Hadron Collider, the Hubble Space Telescope, a written text, a computer, a blackboard and chalk , a crystal ball, etc.