  Femtoscopy has the capacity to probe the space-time geometry of the
particle-emitting source in heavy-ion collisions. In particular, femtoscopy of
like-sign kaon-pairs may shed light on the origin of non-Gaussianity of the
spatial emission probability density. The momentum-correlations between
like-sign kaon-pairs are, hence, measured in data recorded by the STAR
experiment, from $\sqrt{s_{_{\rm NN}}} = 200$ GeV $\mathrm{Au}+\mathrm{Au}$
collisions at RHIC, BNL. Preliminary results hint at the, possible, existence
of non-Gaussian, L\'evy-stable sources; and signal the, likely, presence of an
anomalous diffusion process; for the identically-charged kaon-pairs so
produced. More statistically significant studies, at lower centre-of-mass
energies, may contribute to the search for the critical end point of QCD as
well.
