Anaximenes of Miletus had imagined this substance could compress and rarefy, thus transforming from one to another of the elements from which the world is constituted. They had conceived of a kind of elementary substance from which everything was made. They had become convinced that the variety of natural phenomena must be attributable to something simple, and had tried to understand what this something might be. What Leucippus and Democritus had understood was that the world can be comprehended using reason. ‘Who is there whom we can compare with him for the greatness, not merely of his genius, but also of his spirit?’ asks Cicero. ‘The most subtle of the Ancients,’ Seneca called him. Democritus, the great pupil who wrote dozens of works on every field of knowledge, was deeply venerated in antiquity, which was familiar with these works. Together, these two thinkers have built the majestic cathedral of ancient atomism. On his arrival in Abdera, Leucippus founded a scientific and philosophical school, to which he soon affiliated a young disciple, Democritus, who cast a long shadow over the thought of all subsequent times. He wrote the book The Great Cosmology, in which he advanced new ideas about the transient and permanent aspects of the world. The traveller’s name was Leucippus little is known about his life, but his intellectual spirit proved indelible. It was to be a crucial journey for the history of knowledge. mass number (mass : charge ratio).According to tradition, in the year 450 BCE, a man embarked on a 400-mile sea voyage from Miletus in Anatolia to Abdera in Thrace, fleeing a prosperous Greek city that was suddenly caught up in political turmoil. Isotopes are separated through mass spectrometry MS traces show the relative abundance of isotopes vs. There are naturally occurring isotopes and isotopes that are artificially produced.
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