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RE: Dumb & Dumberer: Why Are Human Brains Shrinking?
The size isn't important, a T-rex had a huge brain but in relation to it's mass it's brain was tiny. The ratio of the brain size to the body mass (minus fat cells) is what's key - otherwise tall men would always be more intelligent than small men and being overweight would make people incredibly stupid. So height for height a man has heavier bones than a woman so he needs a larger head. Similarly, people with angular leg bones have less mass, height for height, than people with rounder bones, but they have longer legs, a narrower pelvis, a shorter spine, a longer neck and a smaller head.
If our bodies shrank as fast as our brains have been doing in the last 20,000 we would have to be the size of pygmies to still have the same ratio of proportional scaling.
Lol. Really? How big were people 20,000 years ago?
It is not a 1-1 ratio. It takes a large amount of the brain just to control all the 'background programs' needed to live. Once you have that complete, you can add mass but the brain doesn't have to grow as much. If someone is 10% bigger, the brain will only need to become a small percentage larger to control that extra mass, nowhere near 10%. So that 10% of our brain that we lost equals us being pygmy sized.

Yes, I was wondering if we are pigmy sized compared to people 20k years ago.
Also, maybe the slower reactions are simply due to toxoplasmosis.
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.
Aboriginals have consistently scored the lowest average IQ when tested and they have been tested numerous times spanning decades. The second lowest? Pygmy peoples.
Maybe they are consistent about not giving a shit about dumb tests.