Like it or not, unmanned aerial vehicles (UAVs) are a growing feature in skies around the world, and ­avionics scientists and engineers are busy designing systems and planning for how they will interact with manned aircraft and eventually diminish the need for pilots in cockpits. For the latest thinking on the subject of UAVs, see the ebook from Rockwell Collins, the second in a series, called "Awareness: the most critical step to facilitate the convergence of manned and unmanned aviation." The ebook is available for free download in Adobe PDF format from www.rockwellcollins.com. In addition to the latest information on current UAV technology, the ebook covers UAV activity in airspace at some of the world's ­busiest airports, according to Rockwell Collins, and an animation that demonstrates "sense-and-avoid technology from the vantage point of the UAV."