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I just received an ad enclosed in my electricity bill for the
"Guardian Angel" lightning detector. It is a hand-held, battery-
powered device that is supposed to detect the approach of storms by "
analyzing electromagnetic frequencies in the air." It has LEDs which
light up to give the distance to the storm/lightning up to 40 miles
away. The ad suggests taking it "while you golf, picnic, boat...It
might just save your life."