How do you make mowing the lawn easier? Use a self-propelled mower.

All you have to do is steer.
Smithsonian Magazine

Long Before Machine Guns, Ancient Roman Troops Used This 2,000-Year-Old Rapid-Fire Weapon in Pompeii, New Research Suggests

Ancient Roman forces may have used the polybolos to quell a rebellion at Pompeii in 89 B.C.E. The unique weapon was likely ...