You walk into the doctor with a cold. They prescribe an X-ray.

You walk in with a headache. X-ray.

Need glasses? X-ray.

Depressed? X-ray.

Imagine every time you went to the doctor, no matter what was wrong, you got the same treatment — and most times, it did nothing. Or worse, it caused more harm. Two hundred years ago in the U.S., that was about the case. Whatever your ailment, many “doctors” reached for the same handful of treatments for any condition: bloodletting, purging, opium, and few others. Come in with anything from a headache to chest pain, you’d be walking away with the same treatment.

What changed? The medical field developed evidence-based consensus around the cause of diseases and the effects of treatments. They accepted that different diseases had differe…

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