Sociology
The Demography of Homelessness: Invisible Populations and the Hard-to-Count
Quick fact
Official homeless counts often miss more than half of the actual homeless population because many avoid shelters and public spaces, and standard surveys systematically undercount them.
Why this is interesting
You see a person sleeping on a park bench, but another is hidden in an abandoned building, and many more are 'doubled-up' on a friend's couch. How can we count people who are deliberately invisible?