It is astonishing that in certain regions of the world, children are still suffering from iodine deficiency.
http://www.bbc.co.uk/programmes/p044w379
The simple remedy is the daily use of iodine salt.
The ailment of iodine deficiency is known as goiter (Sp?) and it stops mental development.
The BBC website shows a number of shows about iodine if you do a search of iodine.
Bill