“Doctor, I have an earache.”
2000 B.C. – “Here, eat this root.”
1000 A.D. – “That root is heathen. Here, say this prayer.”
1850 A.D. – “That prayer is superstition. Here, drink this potion.”
1940 A. D. – “That potion is snake oil. Here, swallow this pill.”
1985 A. D. – “That pill is ineffective. Here, take this antibiotic.”
2000 A. D. – “That antibiotic doesn’t work anymore. Here, eat this root.”