the.com/plough

The tool that turned humanity from foragers into landlords of dirt.

means A farming tool with a blade that cuts into soil and turns it over, prepping the ground for planting — also, by extension, to forge steadily ahead through something tough.

from Plough traces to Old English 'plog' or 'ploh,' which probably came from a Germanic root shared with Old Norse 'plógr' — the word likely spread north-to-south with the heavier wheeled plough technology itself, a tool so significant it carried its name along with it across Germanic-speaking Europe. Before that, it's tangled and uncertain; some trace it further to a word meaning a measure of land, the amount one plough-team could work in a day. The American spelling 'plow' is simply a later simplification, not a separate word.

spelling split
British plough, American plow, same blade
ancient upgrade
iron tips turned farming into surplus, surplus into cities
star connection
lent its name to the Plough constellation
unintended consequence
deep ploughing helped cause the Dust Bowl
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