The global rhino population has fallen by 95% since 1900, mainly due to poaching. Now an atomic approach is being used to stop the poachers in South Africa by placing radioactive material into the horns of rhinos. We journey to the South African bush to meet the scientists - as well as the rhinos being protected.

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Presenter: Myra Anubi

(Image: A rhino with its face covered, being guided by two vets in the Waterberg reserve, South Africa, Ayanda Charlie)