When the Quantum Choir Falls Silent: Sound as a Detector of Superfluidity
Superfluidity, a state in which matter flows without friction, has long remained elusive in neutral Bose condensates of excitons.
A Quantum Lego Set for Superconductivity
A superconductor is like a perfect wire — current flows through it with zero loss. The catch is that you have to cool it way down. Physicists have long hunted for materials that superconduct at more practical temperatures. One approach: don't wait for nature to oblige — build your own material, layer by layer, like a Lego set.