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factors are important in 'intelligence' is strong. The US military tested recruits to assign rank and found that black applicants scored lower than whites. However, analysis of the recruits were found to be due to educational differences; black recruits scored very low until the 1950s, when an increase in score corresponded to improved educational standards for all.

This suggests that environmental influences do affect intelligence but so too does inherited intelligence. Not all individuals are born with the same intelligence and many believe this must have something to do with our genes and the way they interact with the environment. Identical twins are more likely to obtain the same score in an IQ test than twins from two separate eggs that have a different genetic make up.
It is important to remember that genes work by interacting with the environment, so social factors will also influence intelligence. Intelligence tests may be more of an assessment of social factors, such as your educational background.
Better schooling, parenting and increased leisure time for activities are believed to have influenced improved IQ scores across the board. Good nutrition means an individual is able to function well both physically and mentally. Although many believe this plays a role in intelligence, it is very difficult to assess. A balanced diet will provide all the foods required to maintain the correct balance of neurotransmitters.

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