The Simpsons

Smart and Smarter - S15-E13

Corrected entry: Lisa says her IQ is 159, but in "Homer's Enemy," we are told it's 156. Lisa hasn't aged in 15 years so it won't have changed. More likely to be writers not remembering what they have said before.

David Mercier

Correction: IQ measurement is not exact, and many factors, such as a person's environment, can affect how well one performs, intellectually speaking, though one's IQ usually hovers around a certain area of the scale. For Lisa to go from 159 to 156 is not unusual (a drop to, say, 136 would be much more cause for concern). She may just have had another test recently.

Xofer

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