I'd guess that more than just some commenting didn't look at the article. There's complaints in the comments that only make sense if you ignore that there's an

I'd guess that more than just some commenting didn't look at the article. There's complaints in the comments that only make sense if you ignore that there's an article at all. But despite Physics Girl's video embedded in there being much better than the text, I can't fault anyone for not watching it. There are many situations where you can read through something, but can't watch a video.