More often than not, you can get "single digit" numbers with the right metric prefixes, and you can pretend they are "nice and round" just about as easily. It's

More often than not, you can get "single digit" numbers with the right metric prefixes, and you can pretend they are "nice and round" just about as easily. It's just another one of those "what you are used to" things. These sorts of "intuition" are largely cultural osmosis, everyone in your culture is used to it and everyone uses it in your culture so it seems more "human" and "sticky" because you are swimming in it at just about all times. (Which is mostly a paraphrase of the conclusion of the video, until "all" of us switch in the culture, none of us switch.)