A new anti-poaching initiative is injecting low-level radioactive isotopes into the horns of live rhinos. The goal is to make the horns easier to detect at international border crossings, where radiation monitors are already in place for security purposes. This method, developed by researchers at the University of the Witwatersrand, aims to deter poachers by increasing the risk of interception and creating a forensic link back to a specific crime scene. The isotopes are carefully selected to be safe for the rhino and its environment while being detectable by sensitive equipment. The technique is seen as a potential game-changer in the fight against the illegal wildlife trade, which threatens rhino populations. For a full exploration of the science and ethics behind this controversial strategy, read the complete article at https://www.technologyreview.com/2026/02/24/1132760/conservationists-making-rhinos-radioactive/.