IQ still rulez

The Illusory Theory of Multiple Intelligences: basically, when you try to measure something which has to do with cognition, you get either IQ or nothing (either your tests' results will be highly correlated with the standard IQ tests, or they will not measure anything robust).
IOW, intelligence is, essentially, one-dimensional (plus noise).
It makes The Bell Curve still relevant (summary: Part 1, Part 2).