2000 BC - Here, eat this root.
1000 AD - That root is heathen, say this prayer.
1850 AD - That prayer is superstition, drink this potion.
1940 AD - That potion is snake oil, swallow this pill.
1985 AD - That pill is ineffective, take this antibiotic.
2000 AD - That antibiotic is artificial. Here, eat this root.
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