Happiness has suddenly emerged as a pop subject with the keen interest shown by luminaries like The Dalai Lama, former Indian President APJ Abdul Kalam, economist Amartya Sen, top psychologists including Mihaly Csikszentmihalyi, Daniel Goleman and Martin Seligman; and historian Darrin McMahon. Nevertheless, the measure of individual happiness has still remained a chimera. This book is a rare Endeavour to look at happiness from the biological angle. The author, Siddhartha Ganguli, who is a pioneer of multi-disciplinary sciences like bioengineering, human factors, psychobiology and human resource economics has regarded happiness, very simply and scientifically, as opposite of stress. The lifetime work of Dr Ganguli, documented in this book, provides ample tips for being happy in all aspects of living and working.