As the world’s largest particle physics laboratory, the European Organization for Nuclear Research (CERN) usually focuses on expanding our understanding of the universe.But lately, some researchers at the institution have been trying to take on one of the biggest killers here on Earth, by applying their particle physics knowledge to cancer treatment.They are developing a particle accelerator, in collaboration with the Lausanne University Hospital (CHUV), to push the boundaries of radiation therapy and zero in on hard-to-reach tumours.Their machine generates very high energy beams of electrons – the negatively charged particles in the nucleus of an atom – with the aim of zapping cancerous cells in a more targeted and effective way.The gigantic linear particle accelerator consists of a 40-metre metal beam with tubes packed in aluminium foil and a vast array of measurement instruments and protruding colourful wires and cables."