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Some are concerned simply with planning the logistics of future wars ; others devise larger and larger rocket bombs , more and more powerful explosives , and more and more impenetrable armour-plating ; others search for new and deadlier gases , or for soluble poisons capable of being produced in such quantities as to destroy the vegetation of whole continents , or for breeds of disease germs immunized against all possible antibodies ; others strive to produce a vehicle that shall bore its way under the soil like a submarine under the water , or an aeroplane as independent of its base as a sailing-ship ; others explore even remoter possibilities such as focusing the sun 's rays through lenses suspended thousands of kilometres away in space , or producing artificial earthquakes and tidal waves by tapping the heat at the earth 's centre . seed gold

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