Dr. Daniel Lieberman is a psychiatrist based in the Washington, DC area.

The unconscious mind is hidden in darkness, but it influences your life in ways you can’t imagine. It determines whether you will be enthusiastic or bored, full of energy or barely able to keep your eyes open. Your unconscious can make you compassionate or fill you with hatred. It chooses what you desire and who you will fall in love with. It can solve seemingly impossible problems with the gift of inspiration, and, sometimes, it possesses you completely, plunging you into an alien world of mystical experience.

Why are we obsessed with the things we want and bored when we get them? Why is addiction "perfectly logical" to an addict? Why does love change so quickly from passion to indifference?

The answer is dopamine, the chemical of desire that always asks for more. Simply put, it is why we seek and succeed; it is why we discover and prosper. Yet, at the same time, it's why we gamble and squander.

The Molecule of More is an international bestseller that’s been translated into 20 languages.