Scientific Method
The logic of the scientific method was set out by John Stuart Mill in 1843 and was [blank] the method of difference. A simple example of what he meant by this is to take two glasses of water which are identical in every [blank] . Introduce a few drops of ink into one of these glasses. The water changes colour! [blank] to Mill's method of difference it is safe to [blank] that the change in the colour of the water is due to the introduction of a new factor - the independent variable - in this case, the ink.
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