It's one of those diseases that doesn't get a lot of attention: a strain of tuberculosis contracted from animals and responsible for 13,000 deaths a year.

A pilot project in Ghana is one of several experiments to see if drones can deliver everything from contraceptives to blood for transfusions.

If you've ever been vaccinated, you may have seen the nurse head out of the room to go to the refrigerator to retrieve your injection. That's because most vaccines must be refrigerated during travel and storage or they lose their effectiveness.

Vaccines typically need what's known as a "cold chain." ...