Science: Rockets?

Nothing is quite so good for military technology as war. At the start of World War I, airplanes and poison gas cut no figure as military weapons; tanks were unheard of. All three proceeded to make big names for themselves. Since the Armistice, military theorists have speculated much about weapons that might be developed in the "war of the future." Now that the "war of the future" has started, speculation is hotter than ever. One device closely watched by advance scouts is the rocket—not small signal rockets, but big rockets carrying high explosives.

Rockets work by the principle of recoil: the combustion...

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