Two couples chat in the waiting room of a guidance counselor at an elementary school in Flint, Michigan. Each family has six children. Some of them are having trouble keeping up at school, with worsening memory and fatigue and irritability. The affected children have physical complaints too. One family lives in a home built in 2012. The other lives in an apartment building that was built before World War II. What questions would you ask, and what information would you need, to determine whether the cause of the children’s problems is due to an inherited disease? What might be a specific environmental explanation?
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