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An analogy comes to mind that I would like to share to illustrate my understanding of the situation. I was one time teaching high school chemistry and was preparing an experiment for the class which involved measuring temperature. I opened up a box of about twenty thermometers for this purpose. For this experiment, the students needed to know very accurately the temperature and, therefore, I desired to know the accuracy of the thermometers (86:7) I could have tested the thermometers by comparing their readings with a standard, for example, by placing them all in boiling or freezing water and seeing if they read the known temperatures of these processes. My test of these thermometers, however, was infinitely simpler: I just looked at them. I lined them all up to see whether they all read exactly the same temperature: they didn't
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