Figure 1: Dipolar interactions in a quantum gas of bosons or fermions. (a) The interaction between two particles with large dipole moments has a characteristic $d$-wave symmetry. (b) In a Bose-Einstein condensate, this interaction causes the gas to implode with a similar $d$-wave symmetry, as shown here for a gas of erbium-$168$ [2]. (c) In comparison, a quantum gas of fermions is stable, as shown for dysprosium-$161$ [1].