The average I.Q in the 70s in the UK was 107 now it's 100.
Scientists believe that the main factor in I.Q is genetics, but I think that their tests are deeply flawed. The main flaws are that they assume that everyone who takes tests are trying their best and similarly, that everyone is at their optimum when they take a test.
In the 40s Aboriginals came out with an average I.Q of 70, which means over there I.Q 100 makes you a genius! I just don't believe it- I think they just couldn't see the point of the test cos they had stuff to be getting on with. I.Q 100 wouldn't even be capable of inventing the wheel!
I think kids these days lack concentration, they are over indulged and they simply can't be bothered trying.