The Heisenberg uncertainty principle says that we cannot know both the position and the momentum of a particle at once Imagine driving a car fitted with a GPS navigation system that glitches ...

Menger. In physics, the Heisenberg uncertainty principle advises us that the momentum and position of an electron cannot be known both precisely and simultaneously. Similarly in mathematics ...

(Heisenberg called this matrix mechanics, soon shown to be equivalent to Erwin Schrödinger's more visualizable wave theory.) The uncertainty principle was hard even for scientists to accept at first.