How do you vaccinate 600,000 children during a war? Watch the full story of how humanitarian workers – supported by UNICEF and partners – worked against all odds to protect children in Gaza against polio. Ahead of #WorldHumanitarianDay, as the humanitarian situation in Gaza grows even more dire, we recognize the humanitarian workers risking their lives in conflict zones around the world, and call for their protection from attacks. Learn more at t.co/Lmv21zkcv8