On 15 December 2025, UNESCO and the International Bureau of Weights and Measures (BIPM) signed a new Memorandum of Understanding (MoU), reinforcing their long-standing cooperation to advance metrology, capacity building in basic sciences, and the role of accurate measurement in sustainable development worldwide. The Memorandum was signed in Paris by Ms Lidia Brito, Assistant Director-General for Natural Sciences at UNESCO, and Mr Martin Milton, Director of the BIPM. It update