Karthiga and Sophie developed a system that ensures balls come off the roof and are not left stuck in drains. They would promote their product using a series of radio interviews. Copy and paste this link to youtube to watch their ad. https://youtu.be/NfsaB2XxiNY Advertising material for Ball-offer-roofer The nano tech computer by Brayden - charged using recycled batteries. Great thinking, Brayden. The Remindanator helps you remember your homework, library books etc. It uses a nifty keypad and storage system. What a fabulous idea! Sign me up for one pronto! :-) Using solar panels, this invention revolutionises mail collection. Brayden has developed a Scratch game as a slick marketing gimmick. He also made a series of pop-up ads. Great work!