The behavior of acoustic or electromagnetic waves reflecting off‎,‎ and scattering from‎,‎ intercepted bodies of any size and kind can make determinations about the materials of those bodies and help in better understanding how to manipulate such materials for desired characteristics‎.‎ This book offers analytical formulas which allow you to calculate acoustic and electromagnetic waves‎,‎ scattered by one and many small bodies of an arbitrary shape under various boundary conditions‎.‎ Equations for the effective ‎(‎self‎-consistent‎)‎ field in media consisting of many small bodies are derived‎.‎ These results and formulas are new and not available in the works of other authors‎.‎