  In fact, the use of positive evidence to disconfirm hypotheses is  endemic to science. For instance, Millikan used positive evidence to  disconfirm the theory that electrical charge is a quantity that  varies continuously. In his famous ‘Oil Drop’ experiment, he found that the amount of charge possessed by a charged oil drop  was always a whole-number multiple of —(1.6 x 10-19)C. The  finding that all observed charges were ‘quantized’ in  this manner disconfirmed the competing ‘continuous  charges’ hypothesis in the same way that positive evidence can  disconfirm grammatical   hypotheses.[16] 