Beamline for Schools 2023 is starting and it reached its 10th edition! BL4S is a physics competition that invites teams of high-school students from all around the world to conceive an experiment that can be performed at the test beam facility of a particle accelerator. In 2023, the winners will be three, two teams will perform their experiments at CERN and one at DESY. There will be additional prizes for a selection of teams (up to 30). All prospective participants who register for the competition will be able to follow online events and virtual visits of CERN and DESY in preparation for their proposal submission. All the information can be found in the official invitation. The deadline is April 12 2023.