In this informative and revealing short programme, Dr. Ray Yip takes us to a classroom in the Gansu province where a group of children, seemingly happy and normal, show strong evidence they have grown up a good part of their lives living with iodine deficiency. As Yip shows us, every child born in an iodine deficient area suffers a substantial intelligence, or IQ loss. Travelling to a salt mine and factory we learn about the progress being made, as well as the problems China still faces, in its attempts to prevent iodine deficiency in the population.