The story of poison is the story of power... For centuries, royal families have feared the gut-roiling, vomit-inducing agony of a little something added to their food or wine by an enemy. To avoid poison, they depended on tasters, unicorn horns and antidotes tested on condemned prisoners. Servants licked the royal family's spoons, tried on their underpants and tested their chamber pots. Ironically, royals terrified of poison were unknowingly poisoning themselves daily with their cosmetics, medications and filthy living conditions. Women wore makeup made with lead. Men rubbed...