Why is David Unaipon on the 50 dollar note?

David Unaipon is featured on the Australian $50 note to honor his contributions as an Aboriginal inventor, writer, and activist. He is best known for his work in the fields of science and literature, particularly for his theories on the rotary mechanical propulsion and his efforts to advocate for the rights and recognition of Indigenous Australians. His image symbolizes the rich cultural heritage and history of Australia's Indigenous peoples. The note also reflects the importance of acknowledging diverse contributions to the nation’s identity.