A short history of medicine:
I have an earache.
2000 B.C. – Here, eat this root.
1000 A.D. – That root is heathen, say this prayer.
1850 A.D. – That prayer is superstition, drink this potion.
1940 A.D. – That potion is snake oil, swallow this pill.
1985 A.D. – That pill is ineffective, take this antibiotic.
2000 A.D. – That antibiotic is artificial. Here, eat this root.