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flag Scientists use radioactive isotopes in rhino horns to help customs agents catch poachers.

flag Scientists in South Africa are using a new method to fight rhino poaching by injecting horns with harmless radioactive isotopes. flag The Rhisotope Project, developed by the University of the Witwatersrand, makes the horns detectable at airports and borders, helping customs agents catch poachers. flag The project aims to protect the declining rhino population, which has dropped to around 27,000 globally from about 500,000 at the start of the 20th century. flag Trials on 20 rhinos showed the isotopes are safe and effective.

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