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Between 14 he was in Strasbourg, probably working as a goldsmith, and here he may have begun printing.In 1438 he entered a contract with three others to develop a refined printing technique and became the inventor of moveable-type mechanical printing in Europe.Empedocles - Some suggest (c.484-c.424) - Greek doctor, poet and philosopher.To account for real change, he assumed that there must be more than one kind of matter, and he postulated four roots as elements; earth, air, fire, and water.Heraclitus - Greek philosopher; first of the Greeks to develop a theory of the human soul; he praised its creative resources and spoke of the importance of self-exploration; he spoke of the logos that is common to all and said that the universe is ruled by logos; he always urged that close attention be given to the polarites and concealed structures emodied in language.His famous claim that an idividual can and cannot step into the same river twice reveals an interest in criteria of unity and identity; even though all material constituents have undergone change, it is still, in a sence, the same river.Love and hate were considered principles of attraction and repulsion that alternately dominated the universe in a recurring cycle.Empedocles presented a kind of biological theory of natural selection in an imaginative poem, On Nature.

His De magnete (1600) propounded the theory that the earth was a giant lodestone with north and south magnetic poles.Phillippus Aureolus Paracelsus (Theophrastus Bombast von Hohemheim) - Swiss physician; controversial figure in medicine and alchemy; promoted the production of chemical medicines for illnesses of the human body; saw the human body as a chemical system monitored by spiritual alchemists; developed many medical remedies; developed theoretical chemistry through sets of metal experiments which produced salt solutions; added salt to mercury and sulphur as components of metals.Georg Bauer - "Agricola" - German educator, city official, and physician Georgius Agricola (Latinized for of George Bauer) is best known as the author of De re metallica (1556), a treatise on mining and metallurgy.Issac Newton - English mathematician and scientist; developed theory of matter; first to demonstrate the color components of white light with a prism and the reconstruction of these colors into white light with a second prism; researched the optical characteristics of chemical substances; studied gravitation and motion; developed the law of gravitation.Ole Christensen Roemer - Denmark; was the first to show that the velocity of light is finite.

His De magnete (1600) propounded the theory that the earth was a giant lodestone with north and south magnetic poles.

Phillippus Aureolus Paracelsus (Theophrastus Bombast von Hohemheim) - Swiss physician; controversial figure in medicine and alchemy; promoted the production of chemical medicines for illnesses of the human body; saw the human body as a chemical system monitored by spiritual alchemists; developed many medical remedies; developed theoretical chemistry through sets of metal experiments which produced salt solutions; added salt to mercury and sulphur as components of metals.

Georg Bauer - "Agricola" - German educator, city official, and physician Georgius Agricola (Latinized for of George Bauer) is best known as the author of De re metallica (1556), a treatise on mining and metallurgy.

Issac Newton - English mathematician and scientist; developed theory of matter; first to demonstrate the color components of white light with a prism and the reconstruction of these colors into white light with a second prism; researched the optical characteristics of chemical substances; studied gravitation and motion; developed the law of gravitation.

Ole Christensen Roemer - Denmark; was the first to show that the velocity of light is finite.

Epicurus - Greek philosopher; founded the system known as Epicureanism.