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Germany’s Angela Merkel stands down as leader of the CDU party, today. The Christian Democrats are to appoint her successor in Hamburg. We speak to a US-based scientist who has developed a miniature wearable that can detect too much exposure to the sun. We speak to the international charity Medecins Sans Frontieres which says it has been forced to end migrant rescue operations in the Mediterranean carried out by its ship, the Aquarius.