When did "chemical" become a dirty word? Forty or so years ago, chemistry -- which had been recognized as a miracle-making boon to humanity - somehow became associated with warfare, sinister food additives, "toxins" and pollution. It's a situation that Dr. Joe Schwarcz aims to put into perspective. Yes, there's a downside to chemistry, he says, but this is dwarfed by its enormous benefits. Dr. Joe's new collection of commentaries...