This is both brilliant and inspirational! There is an Innovation Laboratory in Seattle, WA sponsored by Bill Gates, that has recently engineered a device called Indigo that maintains vaccines at optimum temperature for several days without using electricity, ice, or batteries; thus making it practical to administer them to remote populations.
Pictures and videos of the device in field use here -- https://www.youtube.com/watch?v=CzeILXKwe74
More details here --
https://www.gatesnotes.com/Health/The-big-chill?WT.mc_id=06_13_2018_10_VaccinesColdChain_BG-YT_&WT.tsrc=BGYT
Pictures and videos of the device in field use here -- https://www.youtube.com/watch?v=CzeILXKwe74
More details here --
https://www.gatesnotes.com/Health/The-big-chill?WT.mc_id=06_13_2018_10_VaccinesColdChain_BG-YT_&WT.tsrc=BGYT