[stanz]

Our brains as well as other genetic development really took off upon the invention of war, which is in effect high-speed evolution. If you match two tribes together in a battle, the smartest tribe usually wins. That is the reason our brains grew

I thought it was cooperation in the hunt and the eating of meat that contributed to the growth in brain size. Before you can fight, you need to eat. Social organization follows and you need socialization to wage war.

[Reeses]

I thought it was cooperation in the hunt and the eating of meat that contributed to the growth in brain size.

Then dogs should have brains as big as ours. It was the first murder, the first human with a temper, the first human who decided to rob and rape, that set the ball rolling of our advanced genetics.

[xrp]

I figured it was the Gray aliens from Zeta Reticuli that came down in flying saucers and replaced some of our primate ancestors' DNA with the alien DNA to spawn the human race.

[SauronOfMordor]

I thought it was cooperation in the hunt and the eating of meat that contributed to the growth in brain size. Before you can fight, you need to eat. Social organization follows and you need socialization to wage war.

It's all interrelated. A predator pack needs a large territory, and needs to defend that territory against competitors. Those who are best at utilizing their territory, and in defending it and expanding it, will pass on their genes. Those who are ineffective in defending their territory from encroachment will die out. Somehow, I think there's some applicability here with regards to our current immigration policy...