On the Origin of Species (or, more completely, On the Origin of Species by Means of Natural Selection, or the Preservation of Favoured Races in the Struggle for Life), published on 24 November 1859, is a work of scientific literature by Charles Darwin that is considered to be the foundation of evolutionary biology. Darwin's book introduced the scientific theory that populations evolve over the course of generations through a process of natural selection. The book presented a body of evidence that the diversity of life arose by common descent through a branching pattern of evolution. Darwin included evidence that he had collected on the Beagle expedition in the 1830s and his subsequent findings from research, correspondence, and experimentation.
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Tuesday, 7 September 2021
Charles Darwin's magnum opus: a brief history.
The periodic table: a brief history.
- The periodic table, also known as the periodic table of elements, is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. The structure of the table shows periodic trends. The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.
- The elements from atomic numbers 1 (hydrogen) to 118 (oganesson) have all been discovered or synthesized, completing seven full rows of the periodic table. The first 94 elements, hydrogen to plutonium, all occur naturally, though some are found only in trace amounts and a few were discovered in nature only after having first been synthesized. Elements 95 to 118 have only been synthesized in laboratories, nuclear reactors, or nuclear explosions. The synthesis of elements having higher atomic numbers is currently being pursued: these elements would begin an eighth row, and theoretical work has been done to suggest possible candidates for this extension. Numerous synthetic radioisotopes of naturally occurring elements have also been produced in laboratories.
- The organization of the periodic table can be used to derive relationships between the various element properties, and also to predict chemical properties and behaviours of undiscovered or newly synthesized elements. Russian chemist Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts soon proved to be correct, culminating with the discovery of gallium and germanium in 1875 and 1886 respectively, which corroborated his predictions. Mendeleev's idea has been slowly expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behaviour. The modern periodic table now provides a useful framework for analyzing chemical reactions, and continues to be widely used in chemistry, nuclear physics and other sciences. Some discussion remains ongoing regarding the placement and categorisation of specific elements, the future extension and limits of the table, and whether there is an optimal form of the table.
The Mexican revolution: a brief history.
The Mexican Revolution (Spanish: Revolución Mexicana, 1910–1920) was a major revolution that included a sequence of armed struggles that transformed Mexican culture and government. Although the regime of President Porfirio Díaz was increasingly unpopular after 31 years, there was no foreboding that a revolution was about to break out in 1910. The regime failed to find a controlled solution to the issue of presidential succession, resulting in a power struggle among competing elites, and elites and the middle classes that sometimes involved the "masses". This provided the opportunity in some places for agrarian insurrection. Although often studied as an event solely of Mexican history, "From the beginning to the end, foreign activities figured crucially in the Revolution's course, not simple antagonism from the U.S. government, but complicated Euro-American imperialist rivalries, extremely intricate during the first world war."
Kashmir: a brief history.
In the first half of the first millennium, the Kashmir region became an important centre of Hinduism and later of Buddhism; later still, in the ninth century, Kashmir Shaivism arose. In 1339, Shah Mir became the first Muslim ruler of Kashmir, inaugurating the Salatin-i-Kashmir or Shah Mir dynasty. The region was part of the Mughal Empire from 1586 to 1751, and thereafter, until 1820, of the Afghan Durrani Empire. That year, the Sikh Empire, under Ranjit Singh, annexed Kashmir. In 1846, after the Sikh defeat in the First Anglo-Sikh War, and upon the purchase of the region from the British under the Treaty of Amritsar, the Raja of Jammu, Gulab Singh, became the new ruler of Kashmir. The rule of his descendants, under the paramountcy (or tutelage) of the British Crown, lasted until the Partition of India in 1947, when the former princely state of the British Indian Empire became a disputed territory, now administered by three countries: India, Pakistan, and China.
3rd of George Storrs six sermons.
SERMON THREE"Search the Scriptures, for in them ye think ye have eternal life, and they are they that testify of me; and ye will not come unto me that ye might have life." John 5:39 - 40 SOME translate this text, "Ye do search the Scriptures," &c. It makes very little difference which way it is understood, whether as a command of what should be done, or as a declaration of what was done. Either way, it shows the immense value of the Scriptures, because they reveal eternal life: and it shows, too, that the object they had in searching, was to learn about eternal life. And further, it shows that the Scriptures are the proper place to search for that inestimable blessing. Every man is bound to do this for himself, and not trust to his teachers alone, as I fear too many do. Teachers may be good men - honest men; they may intend to lead the people into truth, and preserve them from error: yet they are but men - fallible men, and may "err not knowing the Scriptures;" and besides, it is possible they may be bad men, who may have some other object in view than to "save souls from death;" but if this is not the case, and they are sincere, still it must be recollected, we have all received our education, from the first dawnings of intellect, under an influence that has necessarily given our minds a bias to a particular theory, or mode of interpreting the Scriptures; that mode may be right, or it may be wrong; be it which it may, our teachers themselves have most likely had their opinions formed by it, and will teach it; but they cannot give an account for us to God; every man must give account of himself |
Now, if the man consents to do this, he acts faith in that physician; and when he gets well, he will doubtless give the doctor all the credit of his cure, and be very likely to recommend him to others. Now, my hearers, that is faith, active faith. Go to Christ the great Physician, in the same way, and your sins, which are a moral disease, will be removed, and you, who are perishing, dying, will be made alive - yes, have life, and live eternally: but if you refuse the great Physician, you must die - die past hope, past recovery - die under an awful weight of guilt - die eternally. But you do not die without a mighty effort on the part of Christ and his followers to save you. Jesus wept over dying men when here on earth; and with all the compassion of the Son of God, in the most tender pity he said, in the language of my text: "Ye will not come unto me that ye might have life." - Shall the Saviour make this lamentation over any of us? O, come to Christ and live.