large rural populations that don't have access to really good power supplies. >> that's right. the world has tons of people that work and live in an area that has either no power or very flaky power. and with flaky power, if the -- you know generator goes out, if the power lines go down, the vaccine goes bad. and it's not just that you lose the vaccine, which is very expensive. but in fact, you kill kids. even in this country. when human organs are moved around enormously valuable a kidney or a heart, you have to keep it cold. today they use little, you know hand-held coolers to do that which is okay unless weather grounds your plane for two days in an airport somewhere, or there's some other logistical nightmare, and then you fall back on doing these. >> reporter: so you charge this with ice. >> mm-hmm. >> reporter: the capital city of