Which of Leonardo Da Vinci's inventions were the most important or impactful on the world? (please only one invention) Please please answer in a short paragraph and include how your selection impacted or changed the world in some way. Ty <3

Well, I know about them but I don't know any information

Cannon barrels (the automatic weapon)

Leonardo was seriously concerned by the insufficiencies of contemporary warfare, especially irritated by the time between cannon fire shots, caused by the need for relocation. Leonardo devised a multi-barreled cannon to spin a line of cannons and recharge another: a precursor of the day modern machine gun.

in about winter like late november to january

can you explain it better