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fayerody said:

Chico Marx, a member of the famed Marx Brothers, once told the story of how a bout of stomach trouble had sent him to the doctor. The doctor prescribed plenty of milk and gave Chico a bottle of pills. "I’ll stop by this evening and see how you’re doing," the doctor said. "In the meantime, drink at least four glasses of milk. Milk is the ticket for curing your trouble. So drink plenty of it."

That evening, the doctor returned, examined Chico and told him, "You’re much better this evening. Just be sure you don’t drink any milk. Not one glass. It’s not for you."

"But, doctor," Chico exclaimed, "only this morning you told me that milk was what I needed and that I should drink four glasses of it."

"Well, what do you know?" the doctor replied. "It certainly goes to show that we’ve made tremendous progress in medicine since the last time I saw you."

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This also sounds like regular medicine. I am anurse. I used to work on a surgical floor of a local general hospital. Every day it seems they would be changing the policy for how to do things. One day it would be "use this way of doing that" the next day it would be" tests show that way doesn;t work use way #2" this goes on all the time. It made me feel like nothing really worked they were just guessing!