Soon, getting medical assistance to rural areas—where half the world’s population still lives—won’t be hindered by power outages anymore. In developing countries (where the majority of the world’s rural residents live), infrastructure is weak, there is a dearth of qualified medical personnel, and resources like electricity are low or sporadically available. As a result, medical supplies often don’t reach remote areas, or if they do, there’s often no functioning refrigerator to store them in. One solution would be to find a cheap way to produce those supplies on the spot.

Read more: A ‘just-add-water’ kit to make instant drugs and vaccines could fix health care access in rural areas — Quartz