A picture taken on August 5, 2021 show Surgical operating rooms inside Shifa Hospital in Gaza City. Israeli authorities prevented the entry of nitrous oxide canisters also known as 'whippets', used as an anaestheticsince the beginning of 2021, according to Palestinian Ministry of Health. The Gaza Strip needs 400,000 litres per year of nitrous oxide for its hospitals to function adequately. Photo by Omar Ashtawy