2000 B.C. - Eat this root
1000 B.C. - Roots are heathen. Say a Prayer
1850 A.D. - Prayer is superstition. Take this potion
1900 A.D. - That potion is snake oil. Take this pill
1940 A.D. - That pill is useless. Take this antibiotic
2011 A.D. - That antibiotic is no longer effective. EAT THIS ROOT
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