Probably the cheapest thing (per IQ point per child) is to remove lead from the environment, and feed the kids something healthy (doesn't have to be too expensi

Probably the cheapest thing (per IQ point per child) is to remove lead from the environment, and feed the kids something healthy (doesn't have to be too expensive) or just educate their parents about what is proper food. This would allow the kids to reach their genetic potential. Reducing poverty kinds correlates with this, but it depends on how exactly the money is spent. A relatively rich person can still feed their child junk food. (I am suspicious about the claim about early-educational programs. I mean, better educational results are a nice thing, but it is not the same as intelligence.)