UFO sightings have fallen dramatically in the last decade.
Why? Because of ubiquitous camera phones. The claim that someone had seen a UFO was always, if ludicrous, unfalsifiable. Now the claim requires the additional layer of absurdity that the observer neglected or failed to record the event on the camera that everyone always carries everywhere. Everyone always carrying a camera everywhere makes it a lot harder to lie about what you've seen.
Which shows, amongst other things, that sunlight is still the best disinfectant. And that the next century is going to have a lot fewer saints than the last if the three miracles requirement for canonisation isn't significantly relaxed.