The concern about leaking liquid alloy is a valid one; gallium will diffuse into many other metals, structurally weakening them. Search around for some interesting videos of gallium being used to turn an aluminum soda can into the consistency of a wet paper towel! It's possible that it has a higher affinity for the co-alloy, making this a non-issue, but I haven't a clue if that's the case.
Drones are, in essence, flying autonomous vehicles. Pros and cons surrounding drones today might well foreshadow the debate over the development of self-driving cars. In the context of a strongly regulated aviation industry, "self-flying" drones pose a fresh challenge. How safe is it to fly drones in different environments? Should drones be required for visual line of sight – as are piloted airplanes? Join EE Times' Junko Yoshida as she moderates a panel of drone experts.