When I was a kid, the US was going to convert to the metric system, and we "learned" it in second grade, third grade, fourth grade - the reason I put learned in quotes is that we learned it the first time, but every grade made a big deal about it - maybe the teachers needed help converting THEIR heads. The only part of the conversion that stuck was the soft-drink industry, which still sells things in 1-liter, 2-liter and even 3-liter bottles. I think the country changed presidents, which somehow axed the whole conversion process, but the bottle-making machinery had already been switched, and was too costly to consider replacing/retooling again!

Cats I know prefer windowsills, which in some old New England houses can be pretty darned narrow, but doortop perching always seems like it should be an Olympic feat - like balance beam for humans!