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1 dzień temu · Before the Digital Age, distance learning appeared in the form of correspondence courses in the 1890s–1920s and later radio and television broadcast of courses and early forms of e-learning.Typically fewer than five percent of the students would complete a course. For example the Stanford Honors Cooperative Program, established in 1954, eventually offered video classes on-site at companies ...
1 dzień temu · The tiger (Panthera tigris) is the largest living cat species and a member of the genus Panthera native to Asia.It has a powerful, muscular body with a large head and paws, a long tail, and orange fur with black, mostly vertical stripes. It is traditionally classified into nine recent subspecies, though some recognise only two subspecies, mainland Asian tigers and island tigers of the Sunda ...
1 dzień temu · A supernova ( pl.: supernovae or supernovas) is a powerful and luminous explosion of a star. A supernova occurs during the last evolutionary stages of a massive star, or when a white dwarf is triggered into runaway nuclear fusion. The original object, called the progenitor, either collapses to a neutron star or black hole, or is completely ...
1 dzień temu · Sine and cosine are written using functional notation with the abbreviations sin and cos.. Often, if the argument is simple enough, the function value will be written without parentheses, as sin θ rather than as sin(θ).. Each of sine and cosine is a function of an angle, which is usually expressed in terms of radians or degrees.Except where explicitly stated otherwise, this article assumes ...
1 dzień temu · An Android phone, showing that it is connected to a 5G network. In telecommunications, 5G is the fifth-generation technology standard for cellular networks, which cellular phone companies began deploying worldwide in 2019, and is the successor to 4G technology that provides connectivity to most current mobile phones.. Like its predecessors, 5G networks are cellular networks, in which the ...
1 dzień temu · Cattle (Bos taurus) are large, domesticated, bovid ungulates widely kept as livestock.They are prominent modern members of the subfamily Bovinae and the most widespread species of the genus Bos.Mature female cattle are called cows and mature male cattle are bulls.Young female cattle are called heifers, young male cattle are oxen or bullocks, and castrated male cattle are known as steers.
1 dzień temu · Enrico Fermi (Los Alamos 1945) The Fermi paradox is the discrepancy between the lack of conclusive evidence of advanced extraterrestrial life and the apparently high likelihood of its existence. As a 2015 article put it, "If life is so easy, someone from somewhere must have come calling by now." Italian-American physicist Enrico Fermi's name is associated with the paradox because of a casual ...
