Here’s a little corollary too: assume the population is divided into two groups, one who is healthy, and the other which has suffered at least minor brain trau

Here’s a little corollary too: assume the population is divided into two groups, one who is healthy, and the other which has suffered at least minor brain trauma or lead poisoning or something. If the average iq of the two groups is 100, then that means the healthy group has an iq above 100 (in my anecdotal experience about 115).