Critical exponents of directed percolation measured in spatiotemporal   intermittency
  A new experimental system showing a transition to spatiotemporal intermittency is presented. It consists of a ring of hundred oscillating ferrofluidic spikes. Four of five of the measured critical exponents of the system agree with those obtained from a theoretical model of directed percolation. 
Peter Rupp, Reinhard Richter, Ingo Rehberg