1. Department of Applied Engineering and Physics, Cornell University, Ithaca, New York 14850
2. Department of Physics, Cornell University, Ithaca, New York 14850
3. Department of Rheology, Anton Paar USA, Ashland, Virginia 23005
4. Department of Chemical Engineering, Stanford University, Stanford, California 94305
5. Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139