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We present a review on the explanation of the RHIC HBT puzzle by a granularpion-emitting source of quark-gluon plasma droplets. The evolution of thedroplet is described by relativistic hydrodynamics with an equation of statesuggested by lattice gauge results. The granular source evolution is obtainedby superposing all of the evolutions of individual droplets. Pions are assumedto be emitted thermally from the droplets at the freeze-out configurationcharacterized by a freeze-out temperature $T_f$. We find that the averageparticle emission time scales with the initial radius of the droplet. Pionswill be emitted earlier if the droplet radius is smaller. An earlier emissiontime will lead to a smaller extracted HBT radius $R_{\rm out}$, while theextracted HBT radius $R_{\rm side}$ is determined by the scale of thedistribution of the droplet centers. However, a collective expansion of thedroplets can further decrease $R_{\rm out}$. As a result, the value of $R_{\rmout}/R_{\rm side}$ can be close to, or even less than 1 for theComment: 8 pages, 4 figures, invited talk presented at the XI International  Workshop on Correlation and Fluctuation in Multiparticle Production, Nov.  21-24, 2006, Hangzhou, Chin

EXPLANATION OF THE RHIC HBT PUZZLE BY A GRANULAR SOURCE OF QUARK-GLUON PLASMA DROPLETS