Medicine
3 questions
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How does general anesthesia switch off consciousness?
Doctors have used it safely for 180 years, yet nobody knows exactly how it turns the mind off.
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How does the placebo effect work?
A sugar pill can ease real pain. How much of the effect is real, and how does belief change the body?
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Why do we age?
Our bodies repair themselves all the time, yet with the years they wear out. Why doesn't evolution prevent it?