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No. 75: May-Jun 1991

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Sli: a somewhat amusing psi phenomenon

Before you snort in derision at SLI, recall that, just as some gardeners have "green thumbs," so do some people appear to induce electronic panic in hightech equipment just by walking into a laboratory. If the thoughts of a human experimenter can affect marine algae (p. 000), why not electrical equipment? Of course, we know why not! But we have heard some pretty weird stories! For that matter, can you account for everything your computer does?

"A strange new phenomenon has recently been studied in detail for probably the first time. It is street lamp interference, or SLI. Author Hilary Evans, a founder member of ASSAP, has established SLIDE, the Street Lamp Interference Data Exchange, to study the reports.

"SLI is the apparent ability that certain people have to switch street lamps on or off merely by being in their vicinity. While it may seem to be a form of psychokinesis, Hilary insists that no conclusion should yet be drawn from the small body of data so far accumulated. The effect is surprisingly common, though most reports so far have come from the USA. ASSAP, in cooperation with SLIDE, now wants to obtain information on the phenomenon in Britain."

(Anonymous; "Standing by the Lamplight..." ASSAP News, no. 39, p. 2, January 1991.)

From Science Frontiers #75, MAY-JUN 1991. 1991-2000 William R. Corliss

Science Frontiers Sourcebook Project Reviewed in:


  • "A sourcebook of unexplained phenomena is therefore a valuable addition to a collection of scientific literature. William R. Corliss has provided this in the past with his source books of scientific anomalies in several subjects, and now he has provided it for astronomy. He has done an excellent job of collecting and editing a large amount of material, taken in part from scientific journals and in part from scientific reporting in the popular or semi-scientific press." -- "The Mysterious Universe: A Handbook of Astronomical Anomalies", reviwed by Thomas Gold, Cornell University, in Icarus, vol.41, 1980

  • "An interesting, systematic presentation of unusual weather [..] This book is recommended for a general audience" --"Corliss, William R., Tornados, Dark Days, Anomalous Precipitation, and Related Weather Phenomena, Sourcebook Project, 1983.", revieweed in Choice, September 1983
  • "..the science is necessarily somewhat speculative, but Corliss's symthesis is based on reputable sources." -- "Corliss, William R. (Compiler). Lightning, Auroras, Nocturnal Lights, and Related Luminous Phenomena" reviwed by Joseph M. Moran, Univ. of Wisconsin in Science Books and Films, Sep/Oct 1983

  • "Before opening the book, I set certain standards that a volume which treads into dangerous grounds grounds like this must meet. The author scrupulously met, or even exceeded those standards. Each phenomenon is exhaustively documented, with references to scientific journals [..] and extensive quotations" -- "Book Review: The moon and planets: a catalog of astronomical anomalies", The Sourcebook Project, 1985., Corliss, W. R., Journal of the Royal Astronomical Society of Canada, Vol. 81, no. 1 (1987), p. 24., 02/1987