15 London finalists in youth innovation competition
Improving mental health, tackling ocean waste and capturing wasted energy are all ideas at the heart of a competition inspiring young Londoners.
The Longitude Explorer Prize has released its final shortlist of 40 projects created by 11-16 years-olds with 15 of the innovations coming from students in the capital.
The competition is designed to inspire young children and get them into STEM subjects.
Henry has been speaking to two of the finalists, Lara and Elspie, and organiser, Maddy Kavanagh.