there are no magnetic monopoles, in nature or in homeopathy. The two 'single-pole' magnetic remedies are made by exposing water to one pole of a magnet for a prolonged period, similarly to the manner of preparation of other remedies from magnetic or radiation sources (x-ray, gamma emissions from positronium decay, x-rays, and electromagnetic radiation). There is nothing inherently absurd about this, nor about a piece of Berlin wall prepared homeopathicallyEmphasis mine; added in homœopathic dose.
Vacuum: The dreadful cost of homœopathic medicinesThis left me too disheartened to ask about diluted vacuum or diluted black hole.
A homœopathic preparation of neutrinos is of course a sovereign remedy for the after-effects of faster-than-light travel.