Word: soils
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Dates: during 1960-1969
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...create a vast new granary, erosion now threatens to turn millions of acres into a dust bowl; most of the new croplands last year failed even to return their seed grain. His hasty campaign to plow under fallow grasslands has impaired huge areas of once-fertile soil since 1958. Khrushchev's evangelical efforts in 1961 to promote mass sowing of corn did more harm than good, as he himself admitted at the meeting...
...stolen, U.S.-made fragmentation bombs buried in the soil, the sabotage was the gravest anti-American terrorist episode in South Viet Nam's war against the Communist Viet Cong -and an unsettling commentary on the Saigon military regime's security apparatus, since the U.S. stadium is next door to Vietnamese Joint General Staff headquarters. (The government belatedly arrested three Vietnamese living near by as suspects.) The incident was also the latest in a fresh wave of terror ism directed at Americans. Two Saigon bars popular with G.I.s have recently been bombed, killing one U.S. serviceman and six Vietnamese...
...body of theory and experience in which they have great confidence. Latest and largest cratering shots, Sedan (100 kilotons) and Danny Boy (400 kilotons), were fired in 1962 and proved that the Ploughshare rules for nuclear explosives work just as well in hard, heavy rock as in loose soil...
Best Depth. The rules are remarkably precise. If a shot is placed at too shallow a depth, as Buster Jangle-U. was, it wastes most of its energy on the air. If it is too deep, it lifts a great amount of soil and broken rock, but lets most of the stuff fall back into the crater...
Polonium, the researchers maintain, occurs naturally in the tobacco leaf, since it is absorbed through the roots of all green plants from the soil. It is also absorbed to a lesser degree from "natural fallout" in the atmosphere...