Between the dates of July 2nd and July 15th, a gathering of 150 science students in year 11-12 from various regions of Australia and the world will take place at the University of Sydney for the Prof Harry Messel International Science School. During the event, attendees will have the opportunity to engage in exciting and motivating scientific activities including discussions with leading researchers, behind-the-scenes tours of research facilities and labs, conversations with undergraduate and early-career scientists, and participation in hands-on experiments and other STEM-related endeavors. Apart from the scientific components of the ISS, attendees will also have the chance to explore the University of Sydney and the scenic city of Sydney while interacting with new friends from around the globe. Additionally, they will be housed in boarding accommodations and receive guidance from a team of exceptional and committed staff.