We enter the next era of drones

These automated flying robots — tiny, cheap and they do not mind to break. In large groups they can save your life or become the most deadly weapon since the advent of the machine gun. What are you when you think about unmanned aerial vehicle? Modest toy with remote control and a propeller, or large unmanned military aircraft? Very soon, these images can be very different: drones are getting smaller, cheaper, can be automatically gather in groups of hundreds or even thousands, like bees or birds.