"Solve for Happy" is a self-help book by Mo Gawdat, first published in 2017. Gawdat, a former Chief Business Officer at Google X, shares his personal journey of overcoming depression and finding happiness after the tragic loss of his son. The book is based on Gawdat's "Happiness Equation," a scientific approach to understanding and achieving lasting happiness. He argues that happiness is a state of mind that can be achieved by changing our perspectives and attitudes towards life. Gawdat explores various topics such as the nature of suffering, the role of ego, and the power of gratitude. He also provides practical exercises and tools for readers to implement in their daily lives to help them cultivate happiness. The book is a unique blend of science, spirituality, and personal experience, and has been praised for its accessible and practical approach to achieving happiness.