This book consists of six parts or six themes in physics and applied physics. Each part or each theme of this book can be read separately from the other parts. Four parts or themes of this book, namely, “quantum dots”, “magnetic junctions”, “magnetic orthogoniopedic effect” and “gravitational wave” may be considered to belong to the field of theoretical physics. The theme of “electronic low pass filter” belongs to the field of applied physics or engineering. From the reading of the theme of “magnetic orthogoniopedic effect” and from the theme of “paradoxes” the reader may encounter new study materials in physics which are most probably not investigated by other physicists before.