Comment by thoroughburro

Given that it is utterly obvious that “no one watched them for 20 minutes at a time” is false, you should accept that this is not as simple as you imagine as a naive layman.

You may well be curious why it wasn’t noticed sooner, but no specialist will inform you when your approach to them is “So, are you just an idiot compared to me, a random nobody who has thought about your field for all of two minutes?” ;)