http://arxiv.org/abs/0906.2009. [19] Cooper, N. R., Shlyapnikov, G. V. Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules Phys. Rev. Lett. 103 , 155302 (2009). [20] Ospelkaus, S. et al. Controlling the Hyperfine State of Rovibronic Ground State Polar Molecules. Phys. Rev. Lett. in press (2009). Preprint at http://arxiv.org/abs/0908.3931. [21] Ospelkaus, S. et al . Quantum-State Controlled Chemical Reactions of Ultracold KRb Molecules. Science , in press (2009). [22] Kotochigova, S. private communication (2009). [23] Roberts, J. L. Bose-Einstein Condensates with Tunable Atom-atom Interactions. PhD diss., University of Colorado (2001). [24] Weber, T., Herbig, J., Mark, M., N¨ agerl, H.-C., Grimm, R. Three-Body Recombination at Large Scattering Lengths in an Ultracold Atomic Gas. Phys. Rev. Lett. 91 , 123201 (2003). [25] Monroe, C. R., Cornell, E. A., Sackett, C. A., Myatt, C. J., Wieman, C. E. Measurement of Cs-Cs elastic scattering at T=30 µ K. Phys. Rev. Lett. 70 , 414 (1993). [26] Bohn, J. L., Cavagnero, M., Ticknor, C. Quasi-universal dipolar scattering in cold and ultra- cold gases. New J. Phys. 11 , 055039 (2009). [27] Gorshkov, A. V. et al . Suppression of inelastic collisions between polar molecules with a repulsive shield. Phys. Rev. Lett. 101 073201 (2008). [28] Wang, D. W., Lukin, M. D., Demler, E. Quantum fluids of self-assembled chains of polar molecules. Phys. Rev. Lett. 97, 180413 (2006). [29] Klawunn, M., Duhme, J., Santos, L. Bose-Fermi mixtures of self-assembled filaments of fermionic polar molecules. arXiv:0907.4612 (2009). [30] DeMarco, B., Bohn, J. L., Burke, Jr., J. P., Holland, M. H., Jin, D. S. Measurement of p -wave threshold law using evaporatively cooled fermionic atoms. Phys. Rev. Lett. 82 , 4208 (1999). Supplementary Information is linked to the online version of the paper at www.nature.com/nature. 14