"Doctor, I have an ear ache."
2000 B.C.- "Here, eat this root."
1000 B.C.- "That root is heathen, say this prayer."
1850 A.D.- "That prayer is superstition, drink this potion."
1940 A.D.- "That potion is snake oil, swallow this pill."
1985 A.D.- "That pill is ineffective, take this antibiotic."
2000 A.D.- "That antibiotic is artificial. Here, eat this root!"
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