Newton was an English physicist and mathematician, and the greatest scientist of his era.
Isaac Newton was born on 4 January 1643 in Woolsthorpe, Lincolnshire. His father was a prosperous farmer, who died three months before Newton was born. His mother remarried and Newton was left in the care of his grandparents. In 1661, he went to Cambridge University where he became interested in mathematics, optics, physics and astronomy. In October 1665, a plague epidemic forced the university to close and Newton returned to Woolsthorpe. The two years he spent there were an extremely fruitful time during which he began to think about gravity. He also devoted time to optics and mathematics, working out his ideas about 'fluxions' (calculus).
In 1667, Newton returned to Cambridge, where he became a fellow of Trinity College. Two years later he was appointed second Lucasian professor of mathematics. It was Newton's reflecting telescope, made in 1668, that finally brought him to the attention of the scientific community and in 1672 he was made a fellow of the Royal Society. From the mid-1660s, Newton conducted a series of experiments on the composition of light, discovering that white light is composed of the same system of colours that can be seen in a rainbow and establishing the modern study of optics (or the behaviour of light). In 1704, Newton published 'The Opticks' which dealt with light and colour. He also studied and published works on history, theology and alchemy.
In 1687, with the support of his friend the astronomer Edmond Halley, Newton published his single greatest work, the 'Philosophiae Naturalis Principia Mathematica' ('Mathematical Principles of Natural Philosophy'). This showed how a universal force, gravity, applied to all objects in all parts of the universe.
In 1689, Newton was elected member of parliament for Cambridge University (1689 - 1690 and 1701 - 1702). In 1696,Newton was appointed warden of the Royal Mint, settling in London. He took his duties at the Mint very seriously and campaigned against corruption and inefficiency within the organisation. In 1703, he was elected president of the Royal Society, an office he held until his death. He was knighted in 1705.
Newton was a difficult man, prone to depression and often involved in bitter arguments with other scientists, but by the early 1700s he was the dominant figure in British and European science. He died on 31 March 1727 and was buried in Westminster Abbey.
segunda-feira, 4 de janeiro de 2010
Isaac Newton (1643 - 1727)
Louis Braille (Coupvray, 4 de Janeiro de 1809 - Paris, 6 de Janeiro de 1852) foi o criador do sistema de leitura para cegos que recebeu o seu nome, Braille.
O ano de 1825 é geralmente indicado como a data do aparecimento do Sistema Braille, mas só em 1829 Louis Braille publicou a primeira edição do seu "Processo para escrever as palavras, a música e o canto-chão, por meio de pontos, para uso de cegos e dispostos para eles". Tinha conseguido criar um ssitema de pontos em relevo, a que deu forma definitiva na segunda edição, publicada em 1837.
ACAPO assinala Dia Mundial do Braille com doação de cão-guia
Quatro de Janeiro é o Dia Mundial do Braille e, para recordar a todos os portugueses que há pessoas cegas que necessitam de apoio, a ACAPO - Associação de Cegos e Amblíopes de Portugal - vai seleccionar um adolescente invisual, que deverá ter entre os 13 e 18 anos, a quem será doado um cão-guia.