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Energy has seldom been found where we need it when we want it. Ancient nomads, wishing to ward off the evening chill and enjoy a meal around a campfire, had to collect wood and then spend time and effort coaxing the heat of friction out from between sticks to kindle a flame.

dcterms:bibliographicCitation

2013 July-August, Henry Petroski, “Geothermal Energy”, in American Scientist, volume 101, number 4: