Radicalism has been inherent in South Australian history from its founding as a free settlement. Based upon the English radical liberal thought of its founders, the State's reputation grew as a progressive colony and the first to entirely separate church from state.
Before and after the arrival of Europeans, Aboriginal peoples had a well-developed cultural understanding and practical knowledge of plants, animal behaviour, local geology and meteorological conditions. Information they provided was frequently vital to the success – and even survival – of early European navigators and explorers.
Sir Charles Todd was a leader in the fields of meteorology, astronomy and communications, and is best remembered for masterminding the construction of the Overland Telegraph Line.