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Copernicus discovered the mathematically yet unproven heliocentric solar system.In his treatise, 'On the Revolutions of the Celestial Spheres' he postulated that the planets, including the earth, revolve around the sun, and that the earth revolved around its axis once every day.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.

Aristotle - updated engraving; Greek philosopher, educator and scientist; undertook a large-scale classification of plants and animals; introduced a method of scientific thinking that still plays a role today.

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.

He also played an importqant role in the development of the Western or Sicilian school of Greek medicine.

He cured a plague at the Sicilian city of Selinus and claimed he was a god.

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The work had a hostile reception when it was published (1543), as it challenged the ancient teaching of the Earth as the centre of the universe.