1. Environment factors, what the country, family demands are. Depends on how much idle time they have, more idle time, more time to think about stuff i guess. Some ppl are fast learners but that too depend on the person's interests.

2. The rate of learning and discovery can be improved if more emphasis were to be put into the science fields. Eg, more rewards for scientists who discover something.

3. Depends on the country's level of education n perhaps LUCK of having a genius being born into the country and how they mold him.