FWIW, this is the main area of research for Dr. Alex Lu at the Harvard School of Public Health.
He gave a talk on the subject for our bee club (before his bee study was done) that I found extremely compelling and upsetting.
In light of the quality of work and affinity for overstated claims (I'm being nice), I'd have to look much more closely before I accepted his conclusions....some of which were quite shocking.
deknow
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