     
2000 b.c.--Here, eat this root
1000 a.d.--That root is bad, here, say this prayer
1850 a.d.--That prayer is superstition, here, drink this potion
1940 a.d.--That potion is snake oil, here, swallow this pill
1985 a.d.--That pill is ineffective, here, take this antibiotic
2009 a.d.--That antibiotic doesn't work anymore, here, eat this root.
Funny stuff  
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