Cooled below 2.18 kelvins, helium becomes extremely odd stuff. It turns into a superfluid that can spontaneously crawl, frictionfree, over the lip of a cup (SN: 4/25/98, p. 271). For 6 decades, helium has been the only superfluid known. In the Sept. 1 Science, however, a group of German and Russian scientists offer experimental evidence that hydrogen might also become superfluid—under very specific circumstances.
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