Just want to throw a pretty interesting observation I read about a few months ago in an Edge essay, but can't find a source on - probably because no one is will

Just want to throw a pretty interesting observation I read about a few months ago in an Edge essay, but can't find a source on - probably because no one is willing to publish or speak freely on it. Would like to find more information. - There is a difference between average brain mass for human males and females - male brains are about 15% larger by mass than female brains, after correcting for mass difference of the male and female bodies Can we assume brain mass is equivalent to neuron count? Please find me a source!