In another thread, many connections were claimed between mysticism and quantum mechanics. My purpose here is not to denigrate, disprove, or criticize mysticism itself in any way. My limited purpose here is only to caution against making over-enthusiastic and hasty connections between QM and mysticism--in short, when it comes to quantum physics, beware of Deepak Chopra.
First example: the Heisenberg uncertainty principle. What it basically says is that physical objects are never perfectly localized. That's why in chemistry, depictions of atoms often don't draw electrons as particles with definite positions, but rather as clouds or orbitals "smeared out" in various shapes around the nucleus:
As you can see, tiny things like electrons can be pretty well "smeared out". That's weird, and cool. Keep in mind, however, that they are not infinitely smeared out. It's not like an electron in an orbital around a hydrogen atom is likely to end up on the other side of the universe. Smeared out though they may be, even electrons still stick to relatively small areas according to the rules of physics they must obey. They aren't magical.
Now, what about large objects familiar to us in ordinary experience, like baseballs? It would be cool if they could be smeared out just like electrons. As it turns out, if you use the Heisenberg uncertainty principle to calculate the uncertainty in the position of a typical baseball, the answer is ~10^-30 mm, or 0.000000000000000000000000000001 mm. That's about
one billion billion millionth the width of a single atom! In other words, ordinary objects like baseballs have an extremely well-defined position. They are hardly smeared out at all. The same is true of other classical objects such as people, brains, the Earth, your coffee, etc.
And this is a very important aspect of quantum physics: when you start going up in the mass/size scale, weird quantum effects all but go away (there are always interesting exceptions, of course). That is why classical physics describes observations of things like baseballs extremely accurately, and why a quantum description is often only necessary when considering
tiny things (like individual electrons--although you can sometimes get a reasonably accurate picture without quantum physics even then). If quantum physics made predictions which go against our everyday observations of baseballs, it wouldn't be a very good theory!
What is the take-home message here? Weird physics at the level of atoms is not a license to extrapolate any weird idea to the level of everyday experience. Deepak Chopra would like to say that quantum physics is about "fields of possibility", and therefore maybe anything is possible, and therefore you should buy his books so you can realize any possibility you want. The truth is that some things are far, far less possible than others. Just ask a baseball.