 Scientists in South Africa are starting a new research project in an effort to save rhinos from poachers. It involves injecting radioactive material into the horns of 20 rhinos. The idea is that radiation detectors already in place at national borders would detect the horns and help authorities arrest poachers and traffickers. Both veterinarians and nuclear experts support the program. They hope the process can be replicated to save other animals vulnerable to poaching, like elephants.