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Charles Robert Darwin, FRS (12 February 1809 – 19 April 1882) was an English naturalist and geologist, best known for his contributions to evolutionary theory. He established that all species of life have descended over time from common ancestors, and in a joint publication with Alfred Russel Wallace introduced his scientific theory that this branching pattern of evolution resulted from a process that he called natural selection, in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding. Darwin published his theory of evolution with compelling evidence in his 1859 book 'On the Origin of Species', overcoming scientific rejection of earlier concepts of transmutation of species. By the 1870s the scientific community and much of the general public had accepted evolution as a fact. However, many favoured competing explanations and it was not until the emergence of the modern evolutionary synthesis from the 1930s to the 1950s that a broad consensus developed in which natural selection was the basic mechanism of evolution. In modified form, Darwin's scientific discovery is the unifying theory of the life sciences, explaining the diversity of life.
The Tacuinum (sometimes Taccuinum) Sanitatis is a medieval handbook on health and wellbeing, based on the Taqwim al‑sihha تقويم الصحة ('Maintenance of Health'), an eleventh-century Arab medical treatise by Ibn Butlan of Baghdad.<br/><br/> Ibn Butlân was a Christian physician born in Baghdad and who died in 1068. He sets forth the six elements necessary to maintain daily health: food and drink, air and the environment, activity and rest, sleep and wakefulness, secretions and excretions of humours, changes or states of mind (happiness, anger, shame, etc). According to Ibn Butlân, illnesses are the result of changes in the balance of some of these elements, therefore he recommended a life in harmony with nature in order to maintain or recover one’s health.<br/><br/> Ibn Butlân also teaches us to enjoy each season of the year, the consequences of each type of climate, wind and snow. He points out the importance of spiritual wellbeing and mentions, for example, the benefits of listening to music, dancing or having a pleasant conversation.<br/><br/> Aimed at a cultured lay audience, the text exists in several variant Latin versions, the manuscripts of which are characteristically profusely illustrated. The short paragraphs of the treatise were freely translated into Latin in mid-thirteenth-century Palermo or Naples, continuing an Italo-Norman tradition as one of the prime sites for peaceable inter-cultural contact between the Islamic and European worlds.<br/><br/> Four handsomely illustrated complete late fourteenth-century manuscripts of the Taccuinum, all produced in Lombardy, survive, in Vienna, Paris, Liège and Rome, as well as scattered illustrations from others, as well as fifteenth-century codices.
Charles Robert Darwin, FRS (12 February 1809 – 19 April 1882) was an English naturalist and geologist, best known for his contributions to evolutionary theory. He established that all species of life have descended over time from common ancestors, and in a joint publication with Alfred Russel Wallace introduced his scientific theory that this branching pattern of evolution resulted from a process that he called natural selection, in which the struggle for existence has a similar effect to the artificial selection involved in selective breeding.<br/><br/> Darwin published his theory of evolution with compelling evidence in his 1859 book 'On the Origin of Species', overcoming scientific rejection of earlier concepts of transmutation of species. By the 1870s the scientific community and much of the general public had accepted evolution as a fact. However, many favoured competing explanations and it was not until the emergence of the modern evolutionary synthesis from the 1930s to the 1950s that a broad consensus developed in which natural selection was the basic mechanism of evolution. In modified form, Darwin's scientific discovery is the unifying theory of the life sciences, explaining the diversity of life.