Elementary particles such as atom, proton, neutron, electron and photon are wave-particles which are governed by quantum principles. This course introduces the basic concepts of quantum mechanics and quantum phenomena through historical reviews and non-mathematical approach, and discusses the major fields of nuclear and quantum engineering such as nuclear fission and fusion, quantum beam science, medical imaging, quantum imaging, quantum computing, etc. In addition to the technical aspects, the course discusses the impacts of energy development on international politics and environmental issues, and the role of quantum technology in the 21st century.