A common cultural belief is that future generations will have gigantic heads to carry their ever expanding brains. The opposite seems to be true.

An NPR story http://goo.gl/0l2GM covers the fact that human brains have actually been shrinking for the past 20-30 million years and our brain tod

ay is a tennis ball size smaller than the brains of cro-magnon man that lived in Europe (10% decrease).

The answer to the mystery lies in a common phenomenon in biology in which domesticated animals like pigs and dogs have all seen their brains shrink compared to their wild ancestors or contemporary wild relatives (e.g. wolves vs. dogs).
There seem to be two evolutionary factors that play here, the first is that specialization requires less total cognitive effort and so the reduced brain conserves energy (the brain accounts for about 20% of the energy we spend).
The second  relates to the fact that in civilized species, the ability to cooperate with other members is rewarded and overly-aggressive members are in disadvantage (another example cited in the story is that Bonobo monkeys, that have smaller brains than chimpanzees, are better at solving problems as a group because the chimps refuse to work together to solve the problem).

Looking at this from an entrepreneurial perspective, two things come to mind:

1.      Entrepreneurs might be the exception in the way we favor foraging in the business world instead of specializing within a lager cooperation.
Personally, in past experiences working in larger organizations I was often reprimanded for questioning rules and creating a lot of friction in the process (an analogy to tarzan jumping on ropes in the jungle as opposed to civilized driving in the highway was once used in an effort to help correct my ways..)

2.      The flip side to the foraging brain of the entrepreneur is tendency to not be very good in cooperating with others (fellow entrepreneurs particularly). The ability to look at the world in a less competitive way and instead look more at symbiotic opportunities around us is key to creating what eventually can become large companies.