Word: needed
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Dates: during 1960-1969
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...Viet Nam doves: "Everyone is entitled to his position, but we need unity as well as division. Dissent is one thing but division is another...
...moon is also a natural, orbiting Cape Kennedy. To blast off, a spacecraft need overcome a pull of gravity only one-sixth as strong as the earth's, and does not have to expend any energy to push through a thick atmosphere...
...maximum gravity that their cargo could withstand. An unmanned craft designed to take a force of 50 G's, for example, could reach escape velocity on a track only four miles long. Manned ships, whose passengers could not be exposed to so high a G-force, would need a track considerably longer...
Manufacturers, too, may eventually find the moon economically irresistible. Anywhere they choose to locate on the 15 million square miles of lunar surface, there is a near perfect vacuum?a condition that is obtained on earth only with thick walls and elaborate pumps, and at great expense. As the need grows for "hard" vacuums in industrial processes on earth, the day may come when certain lightweight, easily transportable items that require a vacuum in their production?electronic tubes, computer components, hearing aids ?can be made more economically in lunar factories...
Metallurgical research would also benefit from the moon's vacuum, in which pure metals with maximum densities could be produced. Manufacturers who need elaborately protected "clean rooms" on earth for their production processes would find that the moon itself is a huge clean room, with no atmosphere to circulate dust and other contaminants around assembly areas...