The discovery that parts of a solid helium crystal could flow through other parts without friction ignited physicists' interest. Independent experiments confirm this unusual superflow, but its origin remains mysterious.

How do voltage-gated ion channels in cell membranes open? The latest work suggests that the process depends on having the correct lipid molecules in the membrane, with phosphate groups being mandatory.

Black holes box at two weights: active galactic nuclei are in the super-heavyweight class, whereas galactic black holes are relative featherweights. But does the same physics pack both objects' punches? It seems that it does.