Thank you, Mr. McMahon, for noting that rainwater today can contain mercury and pesticides as well as particulates. I recall a study out of Spain a decade ago, that found their rainwater was so contaminated with pesticides that it would flunk the drinking water standards for that country.
Standards in the USA are weaker, and we likely use more petrochemical pesticides, including weed killers than most other countries in the world especially now with genetically modified organisms in seeds that make the seeds drink herbicides. This is something that most people don't know, or even think about.
I appreciate your review of this book.