One of the greatest inventions in history is the combine. The concept of threshing and separating grain in one operation revolutionized our food system, as well as redefined our labor force. Consider that in the mid-1800s, 90% of the US workforce was involved in some aspect of farming. Now it’s under 2%. To think my grandfather harvested corn by hand and threw the ears in a wagon! He used the pull-behind model in the 1940s to harvest small grains (that’s him, Fred Nichols, combining oats on our family farm). My mother still talks about dad wearing a Jesse James style mask while operating their first self-propelled combine without a cab.