A Short History of Medicine
'I have a headache':
2000 BCE: Here, eat this root.
1000 AD: That root is heathen. Here, say this prayer.
1850 AD: That prayer is superstition. Here, drink this potion.
1940 AD: That potion is snake oil. Here, swallow this pill.
1985 AD: That pill is ineffective. Here, take this antibiotic.
2011 AD: That antibiotic is artificial.
Here, eat this root.