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Leaves of Grass (1882)/Memories of President Lincoln/When Lilacs Last in the Dooryard Bloom'd at Wikisource. " When Lilacs Last in the Dooryard Bloom'd " is a long poem written by American poet Walt Whitman (1819–1892) as an elegy to President Abraham Lincoln. It was written in the summer of 1865 during a period of profound national mourning ...
The geologic time scale is a way of representing deep time based on events that have occurred throughout Earth's history, a time span of about 4.54 ± 0.05 Ga (4.54 billion years). [5] It chronologically organises strata, and subsequently time, by observing fundamental changes in stratigraphy that correspond to major geological or ...
In physics, time is defined by its measurement: time is what a clock reads. [1] In classical, non-relativistic physics, it is a scalar quantity (often denoted by the symbol ) and, like length, mass, and charge, is usually described as a fundamental quantity.
List of chemical elements. 118 chemical elements have been identified and named officially by IUPAC. A chemical element, often simply called an element, is a type of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z ). [1]
"Uncleftish Beholding" (1989) is a short text by Poul Anderson, included in his anthology "All One Universe". It is designed to illustrate what English might look like without its large number of words derived from languages such as French, Greek, and Latin, especially with regard to the proportion of scientific words with origins in those languages.
Periodic tables usually at least show the elements' symbols; many also provide supplementary information about the elements, either via colour-coding or as data in the cells. The above table shows the names and atomic numbers of the elements, and also their blocks, natural occurrences and standard atomic weights. For the short-lived elements ...
10 −5 s ~ 1 s: 10 12 K ~ 10 10 K (150 MeV ~ 1 MeV) Quarks are bound into hadrons. A slight matter-antimatter asymmetry from the earlier phases (baryon asymmetry) results in an elimination of anti-baryons. Up until 0.1 s, muons and pions are in thermal equilibrium, and outnumber baryons by about 10:1. Close to the end of this epoch, only light ...
v. t. e. A classical planet is an astronomical object that is visible to the naked eye and moves across the sky and its backdrop of fixed stars (the common stars which seem still in contrast to the planets). Visible to humans on Earth there are seven classical planets (the seven luminaries ).