Nearly half of all vaccines go to waste. This is due to the logistical obstacles involved in transporting them to diverse regions of the world. Most vaccines require strict temperature regulation from the manufacturing line to injection into a human arm. Maintaining a constant temperature along the cold (supply) chain is a challenging feat in the best of circumstances. In sub-Saharan Africa and other developing regions, for example, limited transport infrastructure and unreliable electricity compounds the already immense challenges of delivering viable vaccines.