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\citet{1995PhyA..214..185E},  \citet{Espanol_Rubio_Zuniga_1995} for discussion of how HD disturbances propagate, and evidence for faster-than-vorticity interaction. One considers incompressible and the other considers compressible; the vorticity time-scale is not the only important time-scale.\\  \citet{Clercx_1997};\\  \citet{Kao_Yodh_Pine_1993} high-speed experiment finds interaction between colloids is  faster than the  vorticity timescale. Single-particle theory simply scales with parameters to account for interactions at various volume fractions.\\ \citet{nderson_Mitchell_Bartlett_2002} describe an experiment where sonic communication is observed.\\  \citet{Padding_Louis_2006} coarse-graining.