"Doctor,Ihaveanearache."2000B.C.-"Here,eatthisroot."1000B.C.-"Thatrootisheathen,saythisprayer."1850A.D.-"Thatprayerissuperstition,drinkthispotion."1940A.D.-"Thatpotionissnakeoil,swallowthispill."1985A.D.-"Thatpillisineffective,takethisantibiotic."2000A.D.-"Thatantibioticisartificial.Here,eatthisroot!"