First Lines of Liberrman and Long's "The Molecule of More"

 "Dopamine was discovered in the brain in 1957 by Kathleen Montagu, a researcher working in a laboratory at the Runwell Hospital near London. Initially, dopamine was seen simply as a way for the body to produce a chemical called norepinephrine, which is what adrenaline is called when it is found in the brain. But then then scientists began to observe strange things. Only 0.0005 percent of brain cells produce dopamine--one in two million--yet those cells appeared to exert an outsized influence on behavior."

- Daniel Z. Lieberman & Michael E. Long, The Molecule of More