Of the children tested, 8.5 per cent could be classified as mentally retarded (IQ of below 70), compared with the 2-3 per-cent global average . . . in the case of the North . . . the figure was as high as 16.4 per cent.Disease, heavy-metal poisoning and malnutrition, such as iron or iodine deficiencies, can have serious affects on child development . . .???it is good to see a modernizing country ta