In the US, "Football field" is a quick conversion for hectare-sized areas. It also comes in handy for describing vast fortunes ... since a football field stacke

In the US, "Football field" is a quick conversion for hectare-sized areas. It also comes in handy for describing vast fortunes ... since a football field stacked 6 feet deep in hundred-dollar bills holds close enough to one trillion dollars. Or the annual US defense budget. If you change that to ten-dollar bills, you get close to today's richest individuals.