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Cyan comments on This Failing Earth - Less Wrong
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The Flynn effect isn't caused by the fact that IQ tests are getting easier. There's an upwards drift (linear in time) in average score for a given fixed test. In order for the average score to be 100 (as it is supposed to be by definition), the IQ testers have to adjust the scoring normalization periodically. The Flynn effect changes are most apparent in the lower part of the distribution -- the lowest scoring people in the current generation score much higher than those of past generations; the highest scoring people are comparable across generations.
IQ tests are getting harder and other tests (SAT, maybe GCSE) are getting easier. Flynn is stronger in fluid intelligence than crystalline. But there is supposed to be a small crystalline Flynn effect. SAT sounds like pure crystalline intelligence, yet it has the reverse effect.
This is really weird. But the Flynn effect is pretty weird on its own.