The Paradox of Extreme Homeopathic Dilution
In homeopathy, the most potent remedies are those with almost none of the original substance left. Practitioners dilute ingredients until not a single molecule of the source material remains in the final mixture.
This practice relies on the belief that water retains a memory of substances that were once dissolved in it. To reach high potencies, substances are shaken vigorously to transfer their supposed vital energy to the solvent. Modern science maintains that these mixtures are chemically indistinguishable from pure water. Despite this, the tradition continues to be practiced worldwide as a form of alternative medicine.
Source: Homeopathic dilutions