I just happened upon this, and I have to say what initially comes through is (in terms of the moon, magnetics, tides - if you need proof the comings in and out, etc.).
Well, say if I were to happen to need open heart surgery, I wouldn't pick (however I'd not thought of it until this post) but my deduction is this:
We're 80% water, yes? The moon science (ho-hum) can finally after all the whatnot, actually come out and say, well, the tide has something to do w/the moon.
So, steel (or undergoing the knife via surgery) I would think would have much the same issues - possibly blood thinning, going back to even that in which women tend to go into labor and those on the verge of mental stability, come certain aspects of the moon/energy, can (in my opinion) have an affect.
I'm not a scientist, nor a dr. but it seems reasonable to me, if to have surgery, study that of the tides