Phys.org has reported:

Researchers have observed a supersolid quantum state in an exciton-polariton Bose-Einstein condensate at room temperature, according to a study published in Science Advances.

The work involved researchers from the Faculty of Physics at the University of Warsaw, the Military University of Technology in Poland, IBM Research Zurich and the French National Centre for Scientific Research (CNRS). Supersolids are a state of matter; the reported phenomenon occurred at room temperature rather than at temperatures close to absolute zero.