Science: Ghostbusting

The art of most ghostbusters is to expose the tricks performed by fake spirit mediums. Last week Ghostbuster Joseph Dunninger went a step farther. At a seance in the Manhattan offices of Science and Invention, in broad daylight, before 20 perplexed witnesses, he showed a number of "mystical" phenomena which fakers have not yet discovered.

A wax hand was placed on a table and a spectator was asked to choose a number and slowly count to it. When the number was reached the wax hand emphatically stopped the counting by a sharp rap.

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