“In everyday life, there are certain rules we take for granted: cause-and-effect, for instance. Something occurs, and that causes other things to occur dependent on what happened at the start. Different causes lead to different effects. But in the case of quantum physics, the standard rules are fundamentally different. You can’t define even your starting point to arbitrary precision, as there’s an uncertainty inherent to certain properties of your system. There isn’t a predictable, deterministic way to describe how your system evolves over time, only a set of probabilities that you can calculate. And, if you make a definitive enough measurement, observation, or interaction, you will see a single outcome: the effect you were looking for. But the very act of making that measurement, observation, or interaction fundamentally changes the state of your system.”

“How to interpret this behavior has been the subject of debate for nearly a century. The resolution, however, may be unsettling to anyone who comes across it: not to interpret it at all. As puzzling as it sounds, interpretations may be the very thing that prevent us from truly gaining an understanding of our quantum reality.” – Forbes, Feb 7, 2018