Problems for the 39th IYPT 2026 Approved by the IOC on 7 July 2025 Problems for the 39th IYPT 2026 1. Invent yourself A self-starting siphon can be made using a piece of rigid tubing bent into a specific shape. When the siphon is partially immersed in water, it begins siphoning water without the need for initial suction. Investigate how the … Continue reading Problems