On voting day that year, more than 8 million women around the nation showed up to vote for the first time. [Pictured: Suffragists watch as the Governor of Nevada signs the resolution for ratification of the 19th Amendment on Feb. 7, 1920.] 1921: The Emergency Quota Act Everett Historical...
In the Cambrian, about 530 million years ago, a large number of species emerged rapidly, which laid the foundation for the biological evolution in the next few hundred million years. This is an event that Darwin’s theory of evolution cannot explain, and therefore has attracted people’s atten...
The pullback from the heights isn't too sharp, with stocks regaining some ground toward midsession.
Thus the influenza A virus can be cultured in hen's eggs so attesting to host specificity to within 50 million years of evolutionary history (and is known to infect many vertebrate and mammalian species). Again the Ebola virus affects the class of primates. The criticism that bacteria and/or...
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Ventilators with a machine number greater than 14 are generally produced in a structure that can be disassembled up and down. When the ventilator is installed in the well if the cross-sectional area of the well is small, the upper and ...
Note that the internal gas pressure of this plume (path aa) is greater than the external pressure of seawater. The pressure distribution consequent on sealing or choking by alteration reactions at some depth is shown as path bb in Fig. 7. At this point the gas pressure gradient has ...
More than a dozen known impactors created 50 km sized craters (and larger) on Earth. One such example is the Manicouagan crater in Quebec, Canada. The crater is 215 million years old, and exhibits an 85 km diameter (image credit: NASA). ...
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The average rate of phenotypic evolution in early Cambrian lineages (0.561% per million years [pMyr]) is ∼4× the average rate in subsequent lineages (0.136% pMyr; Tables S2 and S3; Figure S3). Similarly, the average Cambrian rate of molecular evolution (0.117% pMyr) is ∼5.5× ...