Very complicated topic. I will assume we don't just mean "possessing a high level of skill". Difficult subject to debate, but for the sake of argument I will say that "genius" is a mixture of intelligence and creativity. This entire post should have lots of "in my opinion" or "excuse my lack of modesty" but I won't litter up my post with disclaimers.
My definitions: Creativity is the ability to produce or design new things. Intelligence is the ability to learn or understand or to deal with new or trying situations. I include "production" in creativity because the person actually needs to generate some output. There is an intensity and curiosity component in intelligence. If anyone wants to nitpick my definitions, please provide better ones of your own first.
See also--
http://www.bluelight.ru/vb/showthread.php?s=&threadid=51935&perpage=25&pagenumber=1
How are intelligence and creativity connected? Can intelligence or creativity be developed?
Each person has a hard ceiling for their intelligence and creativity and the ceiling for each category might be at similar or very different heights. Some people quickly hit the limit on one or both of their categories while other people never maximize their potential.
Beyond basic schooling and a healthy environment, I don't think intelligence can be impacted all that much by environment. Some kids initially benefit from a confidence boost from their parents but they will quickly realize where they stand once they start interacting with other kids their own age. They see that most of their classmates learn the alphabet and are promoted to the next grade so the novelty wears off.
I do think creativity can be influenced by environmental factors because it happened to me. I am not gonna bore people with my family history, but we had very little culture in our home. Two examples:
- I was 12 when I got the chance to sit in a senior level philosophy/logic course during summer session at the local college. It led to a more orderly (but not mechanical) way of thinking. Basically imagine someone trying to organize 1000 sheets of loose paper in a windstorm, and then turning off the wind and handing the kid a stack of folders. It was a chance to tie things together in a deeper or more meaningful way that had not been previously possible.
- I was 14 when I sat down for four months and finished my first full length novel. My parents actively discouraged my efforts (if that gives you some idea) and neither of them have ever read it even to this day. The ability to create an entire alternate reality from scratch, and working on something substantial where there is no goal or "correct" solution, taught me a few things that help me when I am trying to solve a real problem.
Immediately after both of these experiences I could sense a change in the way I approached things. A switch had been turned on. I believe that intelligence and creativity are connected in a multiplicative sense. People started viewing me a multi-dimensional "threat" in things....if that makes any sense. Or perhaps that is about the age when adults can see that a child is more intelligent than them (which clouds this argument). Or maybe kids just grow up and their skills naturally flourish somehow. Regardless, something changed where I was not just the kid who could solve difficult math problems or read challenging books. I had "something" that was not easy for them to describe.
I now believe intelligence can't be significantly changed but creativity can be enhanced through environment (but not above the ceiling of one's potential). As much as I wish it wasn't so, everyone is NOT born equal. Genius can be nurtured if someone is intelligent and some level of creativity has been untapped. But it is hard to tap such ability when you don't get as much sleep as the others because you have to wake up at 4AM to help the family business. If people received their Ph.D. earlier than some, it was because their parents
allowed them to skip grades and
enabled that development. If someone can speak four languages before starting preschool, it also means they had to be
exposed to four languages.
You have to factor in environmental conditions before being impressed by signs of precocious behavior. Not everyone has the benefit of such early opportunities. I definitely agree, however, that
our society is open enough that everyone has the opportunity to reach their full potential (eventually). Feel free to agree or disagree, just remember it is difficult to type up a concise reply to this question.