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Images from Baoshan Zheng (a, b),
Fasil Ayele , NIH (c), Jose Centeno (d)
Figure 2. a) Lesions on the hands of a man, caused by drinking arsenic contaminated water. b) Dental fluorosis caused by fluorine liberated from burning coal briquettes. c) Podoconiosis caused by contact with clays in volcanic soils. d) Goiter occurs due to a lack of iodine in the diet.