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"Mercury exposure, in low doses, is relatively harmless and unavoidable. However, at higher doses mercury exposure can cause serious and irreversible health consequences, such as brain damage. Take this quiz and learn how to avoid mercury exposure and poisoning."^^<http://www.w3.org/2001/XMLSchema#string>
<http://home.howstuffworks.com/home-improvement/household-safety/tips/dangers-mercury-exposure-quiz8.htm>