Background Paragraph: Before iodized salt was developed, some people experienced a number of developmental difficulties, including problems with thyroid gland function and mental retardation. In the 1920s, we learned that these conditions could usually be treated easily with the addition of iodide anion to the diet. One easy way to increase iodide intake was to add the anion to table salt. This simple step greatly enhanced health and development. Large amounts of iodide ion are also found in seaweed such as kelp (see picture above) and saltwater fish. 
Story: People in the coastal area naturally get more iodide from food items because the soil has more iodized salt. But farther we go inland, the soil lacks necessary iodine. As a result, inland population do not get enough iodine naturally.
Where people are in acute need of added iodide, coastal area or inland? Where people are less at risk of mental retardation, coastal area or inland? Where people are more at risk of mental retardation, coastal area or inland? Where people are not in acute need of added iodide, coastal area or inland? Where people would risk thyroid gland problems less if they only use home grown foods, coastal area or inland? Where people would risk thyroid gland problems more if they only use home grown foods, coastal area or inland? Would inland people be less or more at risk of mental retardation than the people in coastal area? Would inland people risk tyroid gland problems less or more than the people in coastal area if they only use home grown foods? Would people in coastal area be less or more at risk of mental retardation than inland people? Would people in coastal area risk tyroid gland problems less or more than the inland people if they only use home grown foods?