It is instructive to examine the pictorial conrmation of some of the features discussed in the previous sub-sections. Fig. shows few frames of the internal dynamics of typical clusters, for ethanol and water. The corresponding movies can be found in the SI material accompanying this paper. What is apparent is that the ethanol clusters live longer than that of water. From this particular example, ethanol cluster lifetime is about 50ps, while that of water less than 10ps. This is precisely at the origin of the radiation scattering pre-peak: since the global structure is long lived, the corresponding atom-atom correlations are saved into the correlation functions, hence producing the high rst peak and depletion secondary peaks typical of alcohol OO correlations. For water, although the clusters are similar, those are destroyed much faster into smaller dimer-like shapes. Although these might be part of other clusters, the internal coherence of the initial cluster is lost. This implies that the chain-like correlations are not We believe that this is reason why there is a phantom cluster peak in the shoulder pre-peak of water S OO (k), which is could be interpreted as both a contact and a cluster peak at k ≈ 2 Å-1 . The evidence of this dual interpretation of the shoulder peak of water is probably related to the dual contradictory picture of water mentioned in the previous section.