That is a good joke, but based on a misconception I hear, which makes it really the joke.
Precise measurements are obtained with quantum mechanic and this is why it is so useful. What it reallys is about is 1. That energy comes in quantum packets defined by the Plank constant. 2. particles can be paired: if the possible spin states are A and B, then each possess both spins at the same time. Thus the proverbial cat is both alive and dead.
Thus if one particle is tested and is read into spin A, then the other pair automatically is now in spin B, no matter how far apart they are.
I’m going to look up spin states in pairs of particles. I don’t know much about that.
What I was referring to was complementary properties of a single particle. Velocity and position is the most well known pair of complementary properties.
“In physics, complementarity is a fundamental principle of quantum mechanics, closely associated with the Copenhagen interpretation. It holds that objects have complementary properties which cannot be measured accurately at the same time. The more accurately one property is measured, the less accurately the complementary property is measured, according to the Heisenberg uncertainty principle. Further, a full description of a particular type of phenomenon can only be achieved through measurements made in each of the various possible bases — which are thus complementary. The complementarity principle was formulated by Niels Bohr, a leading founder of quantum mechanics.”
—Wikipedia