--Michael Shermer, The Wall Street Journal
"One of the best popular science books I’ve read this year."
—Brian Clegg, Popular Science
"Explaining his use of cutting-edge research to undercut Gordon Gekko's infamous mantra ('Greed is good'), Zak is engaging, entertaining, and profound."
—Kirkus Reviews (starred review)
"Stimulating...he demonstrates the intriguing possibility that oxytocin orchestrates the generous and caring behavior we endorse as moral."
"What’s great about reading this book is not just that you feel yourself relieved at shedding the notion that our behavior is purely selfinterested and not just that you get a clear idea of how this clearly important molecule works but that you’re entertainingly taken through Mr. Zak’s experiments, thus getting a terrific view of the scientific process."
— Library Journal
"Paul Zak's investigations into the best things in life are inspired, rigorous, and tremendous fun. We need more daring economists like him."
—Tyler Cowen, author of The Great Stagnation and An Economist Gets Lunch
"Paul Zak tells the remarkable story of how he discovered and explored the biochemistry of sympathy, love, and trust with the narrative skill of a novelist. Philosophy, economics, and biology have never been so entertaining."
—Matt Ridley, author of Genome and The Rational Optimist, on Zak's oxytocin research
“An ancient mammalian molecule prods us to bond with others. Paul Zak offers a most engaging account of this important discovery, bound to overthrow traditional thinking about human behavior, including economics and morality.”
—Frans de Waal, author of The Age of Empathy
"Zak’s scientific quest is to understand what makes people trust one another."
—Kayte Sukel, Big Think
"Zak is an expert on how trust is a key ingredient to the success of economies and trust is related to oxytocin. It is highly entertaining and thought provoking."
—Cyril Morong, The Dangerous Economist
"This is an important book. Empathy, cooperation, trusting, heroism, stinginess, skepticism, anger, tough mindedness: Paul Zak unpacks these and other deeply human feelings with his pioneering research into brain chemistry and his keen journalist eye--exposing the dignity (and treachery) within our common human nature. You will never think about lobsters, gossip, 'butt slapping' footballers, middle management, or the recent housing bubble fiasco the same way again. It's a 'must know' and a great read."
—Helen Fisher, author of Why We Love