> Fritz Renner, Inge Kersbergen, Matt Field, and Jessica Werthmann, for showing that drinking alcohol sometimes improves a person’s ability to speak in a foreign language.

I thought it was common knowledge?

I thought it was common knowledge that it makes you feel like you could speak a foreign language better. I don't think it's that obvious that the improvement would be objective or that others around you would feel the same way about you.

(And of course there's a Ballmer peak in any case.)

Lots of science is "common knowledge"! This is one of those things that I'm glad to see confirmed in a study.

Does this count as evidence for Ballmer Peak?

But now you can put it on wikipedia and cite a proper double-blinded study!

Of course! It also makes you wittier, taller, and better looking. Everybody knows that.