What Is the Placebo Effect?
A placebo has no active ingredient and still produces measurable change. Expectation is not imagination: it alters what the nervous system does, and the effect shows up on brain scans.
neuroscience
Why Do We Dream?
Nobody knows for certain, and that is the honest answer. What is established is when dreaming happens, what the brain is doing at the time, and why you forget almost all of it.
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