howstuffworksdaily on Instagram: "When Vespa launched in the late 1940s, it introduced an unusual solution: a twist-grip gear shifter built directly into the left handlebar. Instead of using a foot pedal, riders changed gears by rotating the grip, which pulled a mechanical linkage connected to the gearbox. This allowed riders to keep both feet flat on the floorboard, improving balance, comfort, and ease of use in stop-and-go urban traffic. The design lowered the learning curve and made scooters