It would be pretty hard to hide from a totalitarian government in an attic if that government had sufficiently comprehensive residency information and this sort

It would be pretty hard to hide from a totalitarian government in an attic if that government had sufficiently comprehensive residency information and this sort of technology. Count the bodies in each house on a regular periodic basis, and then figure out which ones consistently have more people than their census report indicates. You could probably come up with some sort of regimen that would have people coming or leaving the house such that the number of people in it always stayed below what was indicated on the census, but it would still be a major concern. Related are sentences that are grammatically correct, but semantically nonsense: http://en.wikipedia.org/wiki/Colorless_green_ideas_sleep_furiously http://en.wikipedia.org/wiki/Colorless_green_ideas_sleep_fur...