An example of an analogy and metaphor employed in popular science writing:
"…U-235 does not exist in nature in a pure form, and is always found to be strongly diluted by the heavier unfissionable isotope of uranium, U-238 (0.7 per cent of U-235 and 99.3 percent of U-238), which hinders the development of the progressive chain reaction in natural uranium in the very same way as the presence of water prevents wet wood from burning. …
"…if we could do something to prevent the nuclei of U-238 from kidnapping the neutrons before they have a chance to meet a U-235 nuclei, which could cause their fission, the problem would be solved."
George Gamow (1961) One, Two, Three…Infinity. Facts and speculations of science, Revised Edition, Dover Publications, Inc., New York.
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