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 portion.
1940 A.D. - That portion 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.