The students are asked to volunteer to participate in the demonstration by tasting the increasing salt concentrations, and indicating when they are able to taste the salt in the solutions. The results of the demonstration are graphed, and the terms threshold, dose-response and plateau, as well as parts per million, are discussed. The students are also introduced to the history of lead poisoning, including exposure during the time of the Roman Empire, the Egyptians, lead poisoning of Vincent Van Gogh, and the lead poisoning of President Bush's dog Millie. In the last portion of the Lesson, the students test household articles such as a bedpost, fishing sinker, water pipes etc. for lead content. A motivational video describing Environmental Toxicology and showing the life of a Native American who is studying lead poisoning is also included.
Handouts are available for additional information.
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