There is the famous apocryphal story of the physiology lecturer demonstrating the importance of direct observation in a class, by dipping his finger in urine and tasting it, then asking for students to come up and do the same.
"As I said observation is important...
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That scientific methods of analysing urine were available, but it amused the examiners to make the examinees diagnose via taste...
"As I said observation is important...
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