Word: organismic
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Dates: during 1960-1969
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Because the organisms would encounter severe cold if they drifted farther up in the clouds, or extreme heat if they descended too far toward the surface, Morowitz and Sagan speculate that they must be regulated to hover at an essentially fixed altitude. Thus, the organisms could well take the form...
When was the earth formed? What are the ancient milestones in man's development? In recent years, scientists have tackled such mysteries by means of radioactive dating. By comparing the amount of radioactive carbon 14 in a fossil with the amount contained in a living counterpart, for example, paleontologists...
Siegel and his associates incubated the soil in a hostile ammoniac atmosphere, and fed it with a nutrient broth. Within weeks, there appeared a strange microorganism, umbrella-shaped, with radiating spokes and a stalk terminating in a bulb. Though unfamiliar with anything like it, Siegel noted that the organism flourished...
How Do You Do. Three months after Siegel's discovery, Harvard Paleontologist Elso S. Barghoorn reported that he had found 2-billion-year-old microfossils near Kakabeka Falls in western Ontario. Among them were a number of fossils that bore no resemblance to any living organism. One was an...
Siegel's discovery poses a fascinating possibility that has long intrigued other scientists. The earth's once ammonia-and methane-rich atmosphere has since been recast through the release of subterranean gases and the evolution of oxygen-producing photosynthetic plants. Siegel believes that the Kakabekia-like organism has...