Water spring: a model for bouncing drops
  It has been shown that a water drop can bounce persistently, when thrown on a super-hydrophobic substrate. We present here scaling arguments which allow us to predict the maximal deformation and the contact time of the drop. This approach is completed by a model describing the flow inside the drop, and by original experimental data. 
K. Okumura, F. Chevy, C. Clanet, D. Richard, and D. Quere