The global need for medical oxygen is high, but there are huge gaps in safe and affordable access. The first report of its kind identifies not only who is most vulnerable, but how the world can strengthen the supply of medical oxygen to improve public health and pandemic preparedness. We hear first-hand the impact of the USAID freeze on health clinicians in practice. And we learn how health systems are rebuilt after conflict, integrating resilience to protect them against future shocks.Also on the show, can weight-loss drugs curb alcohol addiction? Plus, scientists discover it is not just your tongue that can taste sweetness - sweet taste receptors have been found on the heart, and they could play a role in heartbeat regulation. Presenter: Claudia Hammond Producer: Katie Tomsett