Quote

Quantum mechanics brought an unexpected fuzziness into physics because of quantum uncertainty, the Heisenberg uncertainty principle. String theory does so again because a point particle is replaced by a string, which is more spread out.

Quantum physics is one of the hardest things to understand intuitively, because essentially the whole point is that our classical picture is wrong.

There are a lot of mysteries about quantum mechanics, but they mostly arise in very detailed measurements in controlled settings.

Quantum mechanics broke the mold of the previous framework, classical mechanics, by establishing that the predictions of science are necessarily probabilistic.

If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet.

Since the founding of quantum mechanics in the 1920s, theoretical physics had nurtured an extremely radical tradition.

Old Newtonian physics claimed that things have an objective reality separate from our perception of them. Quantum physics, and particularly Heisenberg's Uncertainty Principle, reveal that, as our perception of an object changes, the object itself literally changes.

The uncertainty principle refers to the degree of indeterminateness in the possible present knowledge of the simultaneous values of various quantities with which the quantum theory deals; it does not restrict, for example, the exactness of a position measurement alone or a velocity measurement alone.

The development of quantum mechanics early in the twentieth century obliged physicists to change radically the concepts they used to describe the world.

If anybody says he can think about quantum physics without getting giddy, that only shows he has not understood the first thing about them.