1. Non-Reciprocity vs. Asymmetry 2. Wave propagation 3. Modulation of wave propagation 4. Materials Systems 5. Tailoring wave directionality in natural and artificial materials 6. Energy modulation in wave propagation through materials 7. Bound States for wave confinement and control 8. Asymmetric and non-reciprocal propagation of electromagnetic and acoustic waves 9. Applications to increased efficiency of energy utilization 10. Outlook for the future