Someone at UC Davis is doing a study of egg contaminants, if you have backyard chickens producing eggs, please give a grad student some help here and send in a couple eggs !
http://ucanr.edu/sites/poultry/Egg_Contaminant_Testing/They are curious if the ubiquitous smoke due to California burning every summer causes animals to intake contaminants. Eggs are a pretty easy way to see, they are also testing for a few other things, lead paint,etc...
