Best evidence yet that a single gene can affect IQ

The best front page headline ever!

“A massive genetics study relying on fMRI brain scans and DNA samples from over 20,000 people has revealed what is claimed as the biggest effect yet of a single gene on intelligence…” (via New Scientist).

But that is not the most significant aspect of this finding. The effect, although real, was miniscule, accounting for less than 2 points in IQ. So, is it any surprise that the authors conclude that, to the extent that genetics influences intelligence, it is a function of the interplay of multiple genes, not just one?