Helen Fisher, one of the world's leading experts on romantic love, identifies four broad personality types, each governed by different chemical systems in the brain. Love is no longer blind, thanks to pioneering scientific research, based on her unique study of 40,000 men and women. Fisher explains each type, shows you how to identify your own type, and helps you use nature's chemistry to find and keep your life partner.Helen Fisher is the chief scientific adviser to Chemistry.com and a research professor in the department of anthropology at Rutgers University. She is the author of Why Him? Why Her? Finding Real Love by Understanding Your Personality Type.