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Although the word dinosaur can be used pejoratively to describe something that is becoming obsolete due to failing to adapt to changing conditions, non-avian dinosaurs themselves did not go extinct due to an inability to adapt to environmental change as was initially theorized. Moreover, not all dinosaurs are extinct (see below). [149] [150 ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 27 January 2025. Problem of the lack of evidence for alien life despite its apparent likelihood This article is about the absence of clear evidence of extraterrestrial life. For a type of estimation problem, see Fermi problem. Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between ...
Nuclear war is an often-predicted cause of the extinction of humankind. [1]Human extinction or omnicide is the hypothetical end of the human species, either by population decline due to extraneous natural causes, such as an asteroid impact or large-scale volcanism, or via anthropogenic destruction (self-extinction), for example by sub-replacement fertility.
For example, Robert Forward's 1980 Dragon's Egg [34] develops a tale of life on a neutron star, and the resulting high-gravity, high-energy environment with an atmosphere of iron vapor and mountains 5-100 millimeters high. Once the star cools down and stable chemistry develops, life evolves extremely quickly, and Forward imagines a civilization ...
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That is, in stronger gravitational fields the size of cells decreases, and in weaker gravitational fields the size of cells increases. Gravity is thus a limiting factor in the growth of individual cells. Cells which were naturally larger than the size that gravity alone would allow for had to develop means to protect against internal sedimentation.
Presently, only one person in the world understands the Doomsday argument, so by its own logic there is a 95% chance that it is a minor problem which will only ever interest twenty people, and I should ignore it. Jeff Dewynne and Professor Peter Landsberg suggested that this line of reasoning will create a paradox for the doomsday argument: [10]
Say what you will about those with red, or "ginger," hair. But the gene that causes the unique hair color may be on its way out. The UK's Daily Record reports researchers in Scotland have claimed ...