Sticky spy UAV turns things upside down with ability to land on walls and ceilings

Sticky spy UAV turns things upside down with ability to land on walls and ceilings:

Micro UAVs that have the ability to slip into tight spaces, including inside buildings, have wide ranging military and search and rescue applications. To reach their full potential, however, these UAVs are going to need to learn how to land in rougher areas that don't always have a horizontal surface to touch down on. One team of scientists has begun taking a huge step towards accomplishing just that by developing a quadcopter with a mechanism that allows it to land on walls or ceilings, stay for a while, and then take off again...
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