“Doctor, I have an earache”

2000BC: “Here, eat this root”

1000BC: “That root is heathen. Say this prayer”

1850AD: “That prayer is superstition. Drink this potion”

1940AD: “That potion is snake oil. Swallow this pill”

1985AD: “That pill is ineffective. Take this antibiotic”

TODAY: “That antibiotic has side effects".

"Here, eat this root”