Police departments in the United States are reported to have bought a foul-smelling liquid developed in Israel to repel protesters. What is "skunk" and how is it used, asks Yolande Knell. It is a truly putrid stench. Palestinians who have been sprayed describe it as "worse than raw sewage" and "like a mixture of excrement, noxious gas and a decomposing donkey". Invented by...

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