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Scientists use radioactive isotopes in rhino horns to help customs agents catch poachers.
Scientists in South Africa are using a new method to fight rhino poaching by injecting horns with harmless radioactive isotopes.
The Rhisotope Project, developed by the University of the Witwatersrand, makes the horns detectable at airports and borders, helping customs agents catch poachers.
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.
Trials on 20 rhinos showed the isotopes are safe and effective.
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Los científicos utilizan isótopos radiactivos en los cuernos de rinoceronte para ayudar a los agentes de aduanas a atrapar a los cazadores furtivos.