Classroom demonstrations of the weird behavior of helium‐4 have roused many physics students out of their early morning stupor. When cooled below 2.18 K, liquid4Heenters a zero‐viscosity, superfluid phase and can creep up and out of its container or shoot up like a fountain. Now,4Heappears to have at least one more trick in its bag: It exhibits superfluid‐like properties even when compressed into its solid phase, according to an experiment done by Eun‐Seong Kim and Moses Chan at Pennsylvania State University.