Revealed: How adding iodine to salt in 1924 made Americans smarter by 15 IQ points

Unfortunately, by adding  fluoride to the water, the American IQ is lowered 15% than normal
 

A new study shows that the mandatory addition of iodine - originally to reduce goiter - also rid many Americans of cretinism - mental retardation caused by a lack of iodine.

MORE:  http://www.dailymail.co.uk/news/article-2377052/How-adding-iodine-salt-America-smarter.html