Through the ABC Teaching Science mailer.
Children in Australian schools can win cash prizes by creating a 60 second science video. The video can be filmed or animation, and must “demonstrate and explain a scientific experiment, principle or concept.” (Full rules here)
Registration closes at the end of September. The prize has been set up thanks to funding from the Victorian Department of Education – but there is a $1000 of prize money available in each state ($400 and $100 for first and second in primary and secondary divisions).