The existence of a new state of matter called a "supersolid" has been called into question by the reports of two groups with apparently conflicting results. Physicists from Cornell University in NY, USA claim to have reproduced previous findings of a supersolid transition in helium below 250 mK (Phys. Rev. Lett. 97 165301). On the other hand, a group from Helsinki University of Technology in Finland has found no transition when helium is cooled down to 10 mK (Phys. Rev. Lett. 97 165302).
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