The Heritage Foundation, believe it or not.

I was in an old mill-worker tenement building today, which got me thinking about the density of human shelter around the world. I covered this subject in THE WELL DRESSED APE, but am too cozy to venture into the frosty attic to retrieve the relevant research paper. So here is someone else’s graphic of how many square feet we humans inhabit, in various parts of the world.

How big is 65.5 square feet? One king-size bed plus a twin.