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Hi, Gwen.  Of course, you could get around Joe's objection by using 
real human lungs.  You can't buy them, but might be able to get them 
from the UC Medical School.  The lungs at the Museum of Science in 
Boston are real, and several other museums as well.

Here's another idea stimulated by Joe's lung capacity exhibit:  on 
average, smokers have lower peripheral skin temperature than 
non-smokers.  You might be able to generate skin temperature data by 
having each visitor measure the temp of their fingers and adding the 
results to a database, either on a computer or on paper.  Probably need 
to track by age and sex as well as smoking history since those things 
affect skin temp too, but you should be able to see a significant 
difference.

Chuck Howarth

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