Key points are not available for this paper at this time.
Droplets emitting surface-active chemicals exhibit chemotaxis toward low-pH regions. Such droplets are self-propelled and navigate through a complex maze to seek a source of acid placed at one of the maze's exits. In doing so, the droplets find the shortest path through the maze. Chemotaxis and maze solving are due to an interplay between acid/base chemistry and surface tension effects.
Lagzi et al. (Mon,) studied this question.
Synapse has enriched one closely related paper. Consider it for comparative context: