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2000 B.C. – Here, eat this root.
A.D. 1000 – That root is heathen. Here, say this prayer.
A.D. 1850 – That prayer is superstition. Here, drink this potion.
A.D. 1920 – That potion is snake oil. Here, swallow this pill.
A.D. 1945 – That pill is ineffective. Here, take this penicillin.
A.D. 1955 – Oops . . . bugs mutated. Here, take this tetracycline.
1960-1999 – 39 more “oops.” Here, take this more powerful antibiotic.
A.D. 2000 – Oops… bugs mutated, Here, use Purell.
A.D. 2008 – The bugs have won! Here, eat this root.