On 7 July the Irish scientist and politician William Molyneux — sent a letter to John Locke in which he put forward a problem which was to awaken great interest among philosophers and other scientists throughout the Enlightenment and up until the present day. In brief, the question Molyneux asked was whether a man who has been born blind and who has learnt to distinguish and name a globe and a cube by touch, would be able to distinguish and name these objects simply by sight, once he had been enabled to see. As is apparent from both his writings and his lectures, Molyneux was highly interested in optics and in the psychology of sight. To some extent this simply reflects the general attitude of his time: optics was a subject that was then engaging the attention of a number of leading scientists. His interest also had a more personal background, however, for his wife had lost her sight in the first year of their marriage.
Ralph Waldo Emerson
Thomas Paine - Wikipedia
The common name of the human species in English is historically man from Germanic , often replaced by the Latinate human since the 16th century. In addition to the generally accepted taxonomic name Homo sapiens Latin : "sapient human", Linnaeus , other Latin-based names for the human species have been created to refer to various aspects of the human character. The Indo-European languages have a number of inherited terms for mankind. Etymologically, it may be an ethnic or racial classification after "reddish" skin colour contrasting with both "white" and "black" , but Genesis takes it to refer to the reddish colour of earth, as in the narrative the first man is formed from earth. In some tribal or band societies, the local endonym is indistinguishable from the word for "men, human beings".
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One of the 20th century's most influential philosophers of science ,    Popper is known for his rejection of the classical inductivist views on the scientific method in favour of empirical falsification. According to Popper, a theory in the empirical sciences can never be proven, but it can be falsified, meaning that it can and should be scrutinised with decisive experiments. Popper was opposed to the classical justificationist account of knowledge, which he replaced with critical rationalism , namely "the first non-justificational philosophy of criticism in the history of philosophy". In political discourse, he is known for his vigorous defence of liberal democracy and the principles of social criticism that he believed made a flourishing open society possible.