A retired writer, John D. MacArthur is currently polishing a work of fiction, as well as researching the connection between copper and Alzheimer's disease. GreatSeal.com is his popular and respected website that provides accurate information about the history and significance of America's official emblem. The Human Brain is a major section he wrote in 2001 for the Franklin Institute Science Museum about how to nourish, exercise, protect, and rest your brain. Cell Phones and the Brain reviews the cognitive consequences of radiofrequencies interacting with biological processes. Don't Be Takin' Fluoride uses government data to deconstruct the sales pitch for water fluoridation (with charts comparing fluoridation and disease rates by state). John's July 19, 2010 comments to EPA summarize epidemiological data suggesting millions of Americans are suffering adverse health effects resulting from the failure to properly regulate fluoride in drinking water.