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Submission + - When does "the observed" become fact? When does data suggest "knowledge?"

An anonymous reader writes: Our eyes can be deceived, no doubt about it, but, what do we do when "data" does not fit known patterns? When does the observed turn into fact? I am sure that Ohm did enough readings on voltages and currents to say the observed turned to fact: E=IR. But, some things are not as clear as reading a meter. What do we do then? Is the observer always declared wrong, or at some point do we change the "observed" to "fact?"

Here is a story about "officials" — (as in doctors, nurses, police) who say they saw a 9 year old boy walk backwards up a wall. Do we disbelive the observers or do we somehow after enough "viewings of such events" say that it is possible to walk up a wall or be demon possessed?

Here is the story ->
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When does "the observed" become fact? When does data suggest "knowledge?"

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How many QA engineers does it take to screw in a lightbulb? 3: 1 to screw it in and 2 to say "I told you so" when it doesn't work.