Scientists engaged in the Rhisotope project are making rhino horns radioactive to save the species from poachers. According to Arrie van Deventer, founder and managing director of the South African Rhino Orphanage (https://therhinoorphanage.org/), this Rhisotope project "could be the Holy Grail to save the species". More details about this groundbreaking Rhisotope project could be found here: https://rhisotope.org/