Qn. for Jan 14th

Water memory is a conjecture that water is capable of retaining a "memory" of substances once dissolved in it to arbitrary dilution. Shaking the water at each stage of a serial dilution is claimed to be necessary for an effect to occur. The concept was proposed by Jacques Benveniste to explain the purported powers of X, where solutions are diluted to such a high degree that not even a single molecule of the original substance remains in most final preparations.

Benveniste published a paper in 1988 in the prestigious scientific journal Nature describing the action of very high dilutions of an antibody on the degranulation of human basophils. He concluded that the configuration of molecules in water was biologically active. Subsequent investigations have not supported Benveniste's findings,
which are now cited as an example of pathological science.

Identify X.