One might say that since this awkward quantum theory deals with the very “tiny”, who cares?
Wrong. As a matter of fact the very existence of solid bodies, the strength and physical properties of materials, the nature of
chemistry, the colors of substances, the phenomena of freezing and boiling, the reliability of inheritance, these, and many familiar properties, require the quantum theory for their explanations.

On the other hand, quantum theory has been an outstanding successful theory and underlies nearly all of modern science and technology. It governs the behavior of transistors and integrated circuits, which are the essential components of electronics devices such as television and computers, and is also the basis of modern chemistry and biology. In short, it is almost impossible to imagine the modern world without the contributions of quantum theory.