Where in the U.S. are UFO sightings most common? What shapes do these unidentified objects usually take? What time of day do we typically notice them? Datavisualization expert John Nelson combined census data with nearly 90 years of statistics, compiled by the National UFO Reporting Center, to find out. “Of course, as is the case for any observation data, there is a strong tendency towards echoing a population map,” Nelson writes on his blog. “This is certainly the case with this sighting data, as well. In order to visualize the actual sighting phenomenon, I needed to normalize by the underlying population.”