AdvertisementA Revolutionary Solar Fridge Will Help Keep COVID Vaccines Cold In Sub-Saharan AfricaJune 29, 2021Jason BeaubienfacebookEmailIn all of Sierra Leone, only one functioning freezer meets the cold storage requirements for the Pfizer vaccine. It's housed in a complex at the Ministry of Health's medical compound in the capital Freetown and is only slightly larger than a residential fridge. (Jason Beaubien/NPR)