I'm a physicist who searches for aliens. UFOs don't impress me.

For one thing, first-person accounts, which are notoriously inaccurate to begin with, don’t provide enough information for an empirical investigation. Scientists can’t accurately gauge distances or velocity from a pilot’s testimony: “It looked close” or “It was moving really fast” is too vague. What a scientist needs are precise measurements from multiple viewpoints provided by devices that register various wavelengths (visual, infrared, radar). That kind of data might tell us if an object’s motion required engines or materials that we Earthlings don’t possess. Perhaps the videos offer that kind of data? Sadly, no. While some researchers have used the footage to make simple estimates of the accelerations and other flight characteristics of the U.F.O.s, the results have been mixed at best. Skeptics have already shown that some of the motions seen in the videos (like the ocean skimming) may be artifacts of the cameras’ optics and tracking systems. There are also common-sense objections. If we are being frequently visited by aliens, why don’t they just land on the White House lawn and announce themselves?