The Australian overland telegraph was a 3,200 km line connecting Port Augusta in South Australia to Darwin. It was completed in 1872 and allowed communication between Australia and the rest of the world. It was one of the great engineering feats of 19th-century Australia and was a significant milestone in Australia’s development. The line was built due to the determination of one man, a government employee, Charles Todd. As we celebrate 150 years since the line was completed, Sharon Carleton looks at the Charles Todd story, who it turns out was the first pioneer of STEM, way before the acronym had come into use.