We know relatively little about Pythagoras. He was born on Samos in the Aegean in the sixth century, possibly c. 572 BCE. After travelling he founded a school of natural philosophy at Croton in Southern Italy, but he left no writings and students of the school probably attributed some of their discoveries to him, making it difficult for us to know what he developed. We believe he originated number theory and helped prove earlier mathematical theories, as well as arguing that the earth was the centre of a spherical universe.Born in 384 BCE in Greece, Aristotle grew up to be one of the most important figures in Western intellectual, philosophical and scientific thought, imparting a framework which underpins much of our thinking even now. He ranged across most subjects, providing theories which lasted for centuries, and advancing the idea that experiments should be a driving force for science. Only a fifth of his surviving works survive, around a million words. He died in 322 BCE.Born c. 287 BCE in Syracuse, Sicily, Archimedes’ discoveries in mathematics have led him to be labelled the greatest mathematician of the ancient world. He is most famous for his discovery that when an object floats in a fluid it displaces a weight of the fluid equal to its own weight, a discovery he, according to legend, made in a bath, at which point he jumped out shouting “Eureka”. He was active in invention, including military devices to defend Syracuse, but died in 212 BCE when the city was sacked.Little is known of Peter, including his dates of birth and death. We know he acted as tutor to Roger Bacon in Paris c. 1250, and that he was an engineer in the army of Charles of Anjou at the siege of Lucera in 1269. What we do have is the <i>Epistola de magnete</i>, the first serious work on magnetics, one which used the term pole for the first time in that context. He is considered a precursor to modern scientific methodology and author of one of the medieval era’s great pieces of science.The early details of Bacon’s life are sketchy. He was born c. 1214 to a wealthy family, went to university in Oxford and Paris, and joined the Franciscan order. He pursued knowledge in all its forms, ranging across the sciences, leaving a legacy which stressed experimentation to test and discover. He had a prodigious imagination, predicting mechanised flight and transport, but was on several occasions confined to his monastery by unhappy superiors. He died in 1292.Born to a wealthy merchant family in Poland in 1473, Copernicus studied at university before becoming a canon of Frauenburg cathedral, a position he would hold for the rest of his life. Alongside his ecclesiastical duties he pursued an interest in astronomy, reintroducing the heliocentric view of the solar system, namely that the planets revolve around the sun. He died shortly after the first publication of his key work <i>De revolutionibus orbium coelestium libri VI</i>, in 1543.Theophrastus adopted the name Paracelsus to show he was better than Celsus, a Roman medical writer. He was born in 1493 to the son of a medic and chemist, studied medicine before travelling very widely for the era, picking up information wherever he could. Famed for his knowledge, a teaching post in Basle turned sour after he repeatedly upset superiors. His reputation was restored by his work <i>Der grossen Wundartznel</i>. As well as medical advances, he redirected the study of alchemy towards medicinal answers and fused chemistry with medicine. He died in 1541.Born in Pisa, Italy, in 1564, Galileo contributed widely to the sciences, making fundamental changes to the way people studied motion and natural philosophy, as well as helping create the scientific method. He is widely remembered for his work in astronomy, which revolutionised the subject and accepted the Copernican theories, but also brought him into conflict with the church. He was imprisoned, first in a cell and then at home, but he kept developing ideas. He died, blind, in 1642.The seventh son of the first Earl of Cork, Boyle was born in Ireland in 1627. His career was wide and varied, for alongside making a substantial reputation for himself as a scientist and natural philosopher he also wrote about theology. While his theories on things like atoms are often viewed as being derivative of others, his major contribution to science was a great ability to create experiments to test and support his hypotheses. He died in 1691.Born in England in 1642 Newton was one of the great figures of the scientific revolution, making major discoveries in optics, mathematics and physics, in which his three laws of motion form an underlying part. He was also active in the area of scientific philosophy, but was deeply hostile to criticism and was involved in several verbal feuds with other scientists. He died in 1727.The father of arguably the most controversial scientific theory of the modern age, Darwin was born in England in 1809 and first made a name for himself as a geologist. Also a naturalist, he arrived at a theory of evolution through the process of natural selection after travelling on HMS Beagle and making careful observations. This theory was published in <i>On the Origin of Species</i> in 1859 and went on to gain widespread scientific acceptance as it was proved correct. He died in 1882, having won many accolades.Planck was born in Germany in 1858. During his long career as a physicist he originated quantum theory, won the Noble prize and contributed greatly to a number of areas including optics and thermodynamics, while quietly and stoically dealing with personal tragedy: one son died in action during World War 1, while another was executed for plotting to kill Hitler in World War 2. Also a great pianist, he died in 1947.Although Einstein became an American in 1940, he was born in Germany in 1879 and lived there until being driven out by the Nazis. He is without doubt the key figure of twentieth century physics, and probably the most iconic scientist of that era. He developed the Special and General Theory of Relativity and gave insights into space and time which are still being found true to this day. He died in 1955.Crick was born in Britain in 1916. After a diversion during World War 2 working for the Admiralty, he pursued a career in biophysics and molecular biology. He is chiefly known for his work with American James Watson and New Zealand born Briton Maurice Wilkins in determining the molecular structure of DNA, a cornerstone of late twentieth century science for which they won the Noble prize.