“…Through serendipity-- by chewing, brewing, and snorting--some Neolithic souls discovered opium, alcohol, snakeroot, juniper, frankincense, and other helpful substances. Otzi the Iceman, the five-thousand-year-old hunter frozen in the Italian Alps, was found to have whipworms in his intestines and Bronze-age medicine, a worm-killing birch fungus, knotted to his leggings. …”