This modern textbook offers an introduction to Quantum Mechanics as a theory that underlies the world around us, from atoms and molecules to materials, lasers, and other applications. The main features of the book are:

Emphasis on the key principles with minimal mathematical formalism
Demystifying discussions of the basic features of quantum systems, using dimensional analysis and order–of–magnitude estimates to develop intuition
Comprehensive overview of the key concepts of quantum chemistry and the electronic structure of solids
Extensive discussion of the basic processes and applications of light–matter interactions
Online supplement with advanced theory, multiple–choice quizzes, etc.