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IntroductionOne of my father's favorite analogies had to do with arsenic. Imagine a society, he'd say, where people were crazy about arsenicthey loved the way it tasted, and it went with just about every food. They sprinkled it on cereal, stirred it into hot drinks, cooked it into meat, vegetables, bread, desserts. Soon you couldn't buy a food that wasn't doused with arsenic: It was an unbeatable flavor-enhancer and no one could imagine food without it.Then people started getting sick. Some people's hair fell out, others lost their teeth, others got nauseated and dizzy or suffered excruciating headaches. Some people even died, right in the middle of a golf game or after lunch! What was going on? Was there any common link in all these different illnesses?Doctors, nutritionists, and other experts scrambled around trying to cure what seemed to be a growing number of baffling diseases. Some even wondered if it could be arsenicit was in everything, wasn't it? But no, it couldn't be. Look at all the people who ate just as much arsenic as everyone elseand seemed to be fine!So the Hair Association funded research into new hair-lossxiii