New research discovers the twisty secret behind the narwhal's unusually straight tusk

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EU sanctions on Russia explained: the tools, the targets and the limits

Asset freezes, export controls and oil restrictions work in different ways. This guide explains how to read sanctions announcements and what evidence is needed to judge their effects.

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Ukraine’s war-displaced families: why returning home does not end the crisis

Russia’s war in Ukraine has made returning home more complicated than crossing a border. Understand the housing, livelihood and service barriers behind displacement and lasting recovery.