The Children's Museum of Houston had an exibit called Rosie's Tree House, it was an exibit on Allergies for children. We missed it, and it was a little far from us. It did sound like it was good idea.
From their web site
"Rosie is an aspiring scientist who suffers from allergies. Visitors learn about indoor air quality and common allergy causes by: examining Rosie's dust collection using microscopes, playing Allergies True/False, battling dust balls at The Big Achoo, and revealing hidden allergens with the Allergen Detectors."