What if humans were twice as intelligent?

What if humans were twice as intelligent? - msnbc.com: "You might someday be much, much smarter than you are now. At least that's the hope of neuroscientists focused on understanding the basis of intelligence.

They have discovered that the brains of people with high IQs tend to be highly integrated, with neural paths connecting distant brain regions, while less intelligent people's brains build simpler, shorter routes. But no one knows why some brains construct much longer-range connections than others."