The key to any successful operation is good infrastructure, and nowhere is that more obvious than in the field of medicine. Where once upon a time there was no 24-hour number that you could call to get medical attention, now we have 911, which you don't even have to stay on the line for someone to be sent to check on you.
Not only that, but ambulances are ready and traveling around the clock to make sure they can get you to the ER as fast as possible, while pharmacies and doctor's offices are readily-accessible in every major public area. In short, we've built up a pretty effective way of making sure you get the help you need before it's too late.
However, this is a privilege that plenty of other countries aren't lucky enough to have. Infrastructure like that isn't cheap, and as a result, there are tons of places worldwide where the demand for treatment and care outweigh the medical community's ability to get it to them.
Thankfully, a Silicon Valley robotics company has teamed up with the Rwandan Health Ministry to develop something that's easing the problem in a big way: flying robots that can deliver medicine.