ISIS on the offensive in Iraq

[rory_20_uk]

How big does the IQ difference between two people have to be before you can tell there's a difference? IQ is measured in simple numbers, so you should have next to no problems giving an exact number. Or at least a possible range.

IQ tests only show how good you are at that specific test - to be obtuse if I was given an IQ test in Norwegian I'd get almost all of it wrong as I'd not understand the instructions which is a language barrier not my innate cognition.

I'd estimate 10-15 points.