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On a ferociously cold evening in November 1978, Rabbi Everett Gendler climbed atop the icy roof of Temple Emanuel in Lowell, Mass., and installed solar panels to fuel the synagogue\’s ner tamid (eternal light).

\”We plugged it almost directly into the sun,\” said Gendler, who rejoiced that the ner tamid was no longer dependent on the finite and politically questionable energy resources of the Middle East.