[programmernews]

Probably because general intelligence is "the best-established, most predictive, most heritable mental trait ever discovered in psychology." (Geoffrey Miller, Spent)

[chriscool]

I googled it and found the following:

http://www.barrelstrength.com/2013/12/31/ramachandran-iq/

where there is:

"Intelligence (says Prof. Miller at page 189 of Spent) is positively correlated to:

    brain size
    speed of performing basic sensory motor tasks (“reaction time is a factor”, as the cop said in Blade Runner)
    height
    symmetry of face and body
    semen quality (!)
    health, physical and mental
    longevity
    sexual attractiveness for long term relationships"

So it is most predictive of many things, but maybe not of future real-world achievements...