Europe is in the grip of a record-breaking heatwave. To help stay cool, people in France have been turning to an unusual solution – chalk. Here's the science behind the trend. Known as Blanc de Meudon, or Meudon whiting, it is normally used to make paints or as a cleaning product. But faced with punishing temperatures, there are reports that ingenious people have been using the chalky material as a home remedy against the ... [3476 chars]
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