The chemicals that transmit messages between one part of the brain and the other have a name. They’re called neurotransmitters. Dopamine and noradrenaline are among the brain’s many neurotransmitters. They help transmit messages between different parts of the brain. The way these neurotransmitters do this is by locking onto these receptor molecules, an action that produces these feelings—alarm, desire, pain, pleasure, reward. The list goes on. But the brain, always seeking equilibrium, creates neurotransmitters in only limited quantities. By some bizarre coincidence of nature, however, some
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