"…Each memory a person had, such as the memory of the last time you saw your grandmother, or the memory of the fragrance of a gardenia you sniffed when you were sixteen, was believed to have a specific location somewhere in the brain cells. Such memory traces were called engrams, and although no one knew what an engram was made of – whether it was a neuron or perhaps even a special kind of molecule – most scientists were confident it was only a matter of time before one would be found."

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Michael Talbot, The Holographic Universe