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!
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