[user104658]

Originally Posted by Livia

Intelligence is not easily calculable. Like Sandy Toksvig said: Cambridge is full of people who can split the atom but can't change a plug.

That has literally nothing to do with intelligence - they can't change a plug because they haven't learned how to change a plug. If someone shows a particle physicist how to change a plug... they'll be able to change a plug. The average joe couldn't learn and understand advanced physics in three lifetimes.

I will add the obvious note that this does not at all apply in all cases - there are plenty of intelligent people who don't go down an academic route either by choice or circumstance, that's not what I'm talking about. More just pointing out that realistically... anyone who can't do basic DIY tasks actually COULD do them if they learned.