Was in a hotel with my family last weekend, and took part in one of our favorite traditions: watching garbage TV. It seems like every show on the History channe

Was in a hotel with my family last weekend, and took part in one of our favorite traditions: watching garbage TV. It seems like every show on the History channel is now about ancient aliens/unexplained "mysteries"/etc., with the same rotating cast of huckster talking heads. Many of the UFO-themed episodes featured stories as "mysteries" that were convincingly explained years ago (i.e., the Chilean navy video of the jet with exhaust contrails). The question my (entertained, but skeptical) daughters kept asking was: why are the aliens permanently just beyond clear identification? They are so bad at hiding themselves that there are thousands of "sightings"...yet so good at hiding that none of these sightings offers convincing proof. Why are the photos and videos always so grainy/tiny/out of focus? The obvious answer: the videos that are in focus are clearly not aliens. It's an example of selection bias.