Number 118 (Story #2), March 12, 1993 by Phillip F. Schewe and Ben Stein HELIUM CAN FORM DIATOMIC MOLECULES , but only very weakly and only at millikelvin temperatures. Furthermore, the two helium atoms remain at arm's length, 55 angstroms apart. Ronald Gentry of the University of Minnesota creates the molecules by squirting compressed helium gas into a vacuum chamber and then looking for dimers in a mass spectrometer. (Science News, 6 Mar. 1993.)