Word: elements
(lookup in dictionary)
(lookup stats)
Dates: during 1950-1959
Sort By: most recent first
(reverse)
...come an unending stream of speeches, pamphlets and books-some of them by eminent scientists-upgrading or downgrading the dangers of radioactive fallout to mankind, condemning or defending the testing of nuclear weapons. At the crux of the debate is the question: How perilous to man is the key element in H-bomb fallout, strontium...
Since the dangerously radioactive cobalt 60 is not a product of fission, it must have come from some other element, perhaps nonradioactive cobalt 59, exposed to free neutrons given off by the thermonuclear explosion. It could never have been more than a trace in the sea water, or the careful tests made in the Marshalls just after the explosion would have detected it. But clams are apparently better chemists than men are; they went after the cobalt 60 for reasons of their own and collected an astonishing amount of the radioacitve isotope...
...outside disturbances-e.g., friction-will maintain an unvarying spin axis in relation to the "fixed" stars-or any other points of reference-no matter on what path it is carried by the motion of a vehicle or the rotation of the earth. Such a gyroscope is one element of Inertial Guidance. The other element is an electronic "Schuler pendulum" that always points toward the center of the earth, regardless of an aircraft's acceleration (speeding up or slowing down).* The unchanging gyroscope line and the line of the plumb bob, which tells which way is down, form...
...idea of how right and left-handedness in sub-atomic physics may lead to a deeper understanding of the asymmetries of the universe as a whole. The possibility that we may live in a right-handed world is disturbing to physicists who are as yet "unwilling to admit the element of the purely arbitrary into the laws of physics." He also introduced the notion of the symmetry of past and future built into physical laws...
Harvard scored 12 runs in the next three innings to eliminate any element of doubt about the outcome. Besides his home run, Hathaway got two doubles and two walks to round out a perfect...