A NY Times Article about how to raise IQ, covering the malleability of IQ, the role of genetics and class, and the effects different schooling practices can have.

Also, average IQ has risen over time meaning:

…the average I.Q. of a person in 1917 would amount to only 73 on today’s I.Q. test. Half the population of 1917 would be considered mentally retarded by today’s measurements…