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Small Aftershocks. "The chances are small, but not zero," says Seismologist Lynn Sykes of Columbia's Lamont-Doherty Geological Observatory. He and other scientists think that a less dangerous method of earthquake control might be to pump liquid into a fault region. Such fluids would relieve stresses by acting, in part, as underground lubricants. Yet this method also poses dangers. In the Denver area, for example, recent shocks were apparently triggered by the disposal of chemical wastes in deep underground wells...
...Millions visiting Canada's Expo 67 thought they saw the world's most beautiful subway. Now there is a challenger. Who is the builder, and how does he make his subway "float" in an almost liquid subsoil? (See BUSINESS...
...ships at all. The war had destroyed 70% of the Greek merchant fleet, including the three Lemos vessels. To replace them, Lemos bought three U.S. Liberty ships at cut-rate prices. Like many other Greeks, he has devised quite a few new methods and designs, including a combination liquid-dry cargo ship that can haul a load of oil on an outbound voyage and return with a cargo of coal. Partly because of his inventiveness, he has accumulated a fleet of 60 ships totaling 4,500,000 tons; another 2,000,000 tons are on order...
...could even be used for rocket fuel. Moon technicians will decompose it into hydrogen and oxygen gases by electrolysis, then feed the gases into a lunar cryostat, a device that can reach extremely low temperatures during the chill lunar night without using power. The resulting products would be liquid hydrogen and liquid oxygen, familiar space-age fuels...
RUSSIA'S Konstantin Eduardovitch Tsiolkovsky (left) never built a rocket, but by 1898 he had worked out the basic principles of rocket dynamics. America's Robert Hutchings Goddard (right) launched the world's first liquid-fuel rocket in 1926 and patented 214 devices and parts, most of them essential to the operation of modern rocket engines. Germany's Hermann Oberth (center) popularized the idea of space travel as a real possibility in his 1923 bestseller The Rocket into Planetary Space, and his writing helped inspire Germany to early prominence in the field...