As discussed in several previous posts, it is difficult to assess what constitutes a UFO wave. There are a number of methodological challenges linked to the very notion of UFO wave. REPORTING ISSUESOne of the main challenges is that not all UFO sightings are reported, and there can be a number of reasons for that. The first one is that people can be afraid of being turned into ridicule. This fear, however, seems to be much less present in the 21st century as the UFO phenomenon is much more entrenched into the popular culture. The second reason is linked to the first one, and it is about the lost sensitivity about UFOs. A lot of people are rather...