Thanks, electrodoc.
What you're saying is quite true.


??
There are elements of truth in what he posted but by far the vast majority is bogus.
Sorry.
The theory of chiropractic is that subluxations (small displacements) in the spine affect nerve impulses which control organ systems, therefore when anything goes wrong in the body you can fix it by fixing the subluxations. There are four things wrong with that theory: subluxations cannot be detected by medical researchers or x-rays and when chiropractors themselves do blind diagnoses they don't agree either; changes in nerve impulses would be detectable easily but we can't seem to find any; organ systems are controlled by known functions and don't respond to the nerves as chiropractic claims; and manipulating the spine has not been shown to affect the functions of any organ system.
It does feel good to have your back cracked, no question. And when your back goes out, as most of ours will eventually, chiropractic is one method of getting a little relief while you wait for your back to heal. But scientific? Nah.
Acupunture has a theory that is even worse. This mysterious supernatural fluid called chi flows through the body within channels and when out of balance causes all our illnesses. By inserting needles at points we can bring the chi flow back in balance and cure the illnesses.
Same basic four things are wrong with that theory as well. Chi can't be detected today, we only know of it by writings from the ancients, who must have been a heck of a lot smarter than us. The channels can't be detected either, but in the old books you can find maps of where they are. Oh, yeah, three different systems of maps - even the Chinese don't agree on where the channels go. The points aren't detectable either, and again practitioners don't agree on where they are. And there isn't any outcome based evidence that the needling produces any changes in health, except of course in the kind of vague discomfort complaints (fatigue, nonspecific pains, other unmeasurable stuff) that placebos have the most effect on.
You are free to claim that both systems work fine despite not having a scientific basis; some things work before knowing the reason. But to claim there is any science behind either of these is completely bogus.
And if they really worked beyond placebo, by this time there would be outcome measures and progress toward a scientific theory. (Unless you think it's all a conspiracy by the big drug companies to keep it all secret)