“The human mind is a wondrous liquid experiment: a system of organized chemicals that grows itself into the future, like plants with roots in time. Motivation begins deep in the brain, where a neurochemical cauldron of past experiences, present morale, and future goals coalesce to stimulate a particular behaviour: I want that. […] The big drugs—cocaine, opioids, methamphetamine—infect this motivation, wrap you tenderly in a warm dopamine blanket, and then drag you by your ankle behind a runaway horse.”

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