Heisenberg’s uncertainty principle is an essential difference between quantum mechanics and classical physics. He theorized that for any object certain pairs of properties, such as position and momentum, are linked so that they cannot both be precisely determined at the same time because observation can affect the system. This was not a factor in classical physics because it only impacts measurements at the sub-atomic level.
Heisenberg’s Uncertainty Principle challenges the notion of a world that can be fully understood through scientific inquiry.
A joke based on Heisenberg’s uncertainty principle: Heisenberg is pulled over by a policeman while driving too fast. The policeman asks Heisenberg, "Do you know how fast you were going?", to which Heisenberg responds "No, but I knew exactly where I was."
First, Heisenberg’s uncertainty principle set limits on what we could know about the subatomic world.
Michael Crichton -- Jurassic Park
Okay, but if we talk about modern discoveries in subatomics—the Heisenberg uncertainty principle, for example—