The agreement that established the metre as a shared international length standard celebrated its 150th birthday last week. For our Paris-based contributing editor Isabelle Dumé, the celebration was a timely reminder that "peaceful collaboration can triumph." 🧪⚛️ https://physicsworld.com/a/the-evolution-of-the-metre-how-a-product-of-the-french-revolution-became-a-mainstay-of-worldwide-scientific-collaboration/