> if it is so easy to enhance brain functions, why hasn't nature done so herself? A good question to raise, but it has a lot of plausible answers. For example

> if it is so easy to enhance brain functions, why hasn't nature done so herself? A good question to raise, but it has a lot of plausible answers. For example, maybe having better cognitive ability causes people to spend more time doing science and less time procreating/looking after their offspring.