Photos and caption from Fardin’s study: FIG. 1: (a) A cat appears as a solid material with a consis- tent shape rotating and bouncing, like Silly Putty on short time scales. We have De ≫ 1 because the time of observa- tion is under a second. (b) At longer time scales, a cat flows and fills an empty wine glass. In this case we have De ≪ 1. In both cases, even if the samples are different, we can es- timate the relaxation time to be in the range τ = 1 s to 1 min. (c-d) For older cats, we can also introduce a charac- teristic time of expansion and distinguish between liquid (c) and gaseous (d) feline states. [(a) Courtesy of http://cat- bounce.com, (b) http://www.dweebist.com/2009/07/kitten- in-wine-glass/, (c) http://imgur.com/gallery/UuNSR, (d) http://imgur.com/s7JtV ]