well traveled theory that the entire 7 billion could live in the state of Texas. Without doing the math it's quite reasonable to off the top of your head look at the numbers and make that top-of-the-head estimate.
Having seen the math I can now see how they got those numbers. However keep in mind that the quarter acre lot needs to support the food needs of the 4 people - do-able with some ingenuity but probably not do-able by the standards of say... 1920's living in America.
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