[Transcriber's Note: This etext was produced from Startling Stories, March 1948. Extensive research did not uncover any evidence that the U.S. copyright on this publication was renewed.] The bit of whitish substance fluoresced, which of course was quite natural. It also vibrated very faintly, which was unnatural. At least, this property had not been known previously--which is really saying little since the material had been compounded from artificial radioisotopes from the big piles. All too little was known about such items and the fact that this one was vibrating ever so faintly whenever the electron beam struck it was interesting both from a scientif…
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