A Short History of Medicine (Author Uknown)

Doctor I have an earache:
    
   2000 BC: Here, eat this root.

     AD 1000: This root is heathen. Here, say this prayer.
         
       AD 1850: That prayer is superstition. Here, drink this potion.
        
         AD 1940: That potion is snakeoil. Here, swallow this pill.
         
           AD 1985: That pill is ineffective. Here, take this antibiotic.
          
             AD 2000: That antibiotic is artificial. Here, eat this root.