At the heart of any successful scientific theory lies the ability to make reliable predictions. A theory should enable convenient and accurate prediction of experimental outcomes or, at the very least, assign appropriate probabilities to each possible outcome. From this perspective, quantum mechanics is a mature and established theory that has stood the test of time. It has the ability to calculate and explain experimental data collected in various fields, such as electromagnetic radiation of atoms, molecules, and elementary particles, while also serving as a fundamental framework for solid-state physics.

However, the main goal of a physical theory is not solely to predict experimental outcomes. It should also provide insights into the underlying physical phenomena that are responsible for specific experimental observations. During this seminar, we will examine a particular experiment from a theoretical standpoint and discuss some of the conceptual and fascinating problems that arise. By doing so, we hope to gain a deeper understanding of the intricacies of quantum theory and reality.