What invention changed life in the cities?

The invention of the electric light bulb significantly changed life in cities by extending productive hours beyond daylight and enhancing safety at night. This innovation enabled businesses to operate longer and transformed social activities, contributing to the rise of nightlife and urban culture. Additionally, it facilitated the growth of public transportation and infrastructure, reshaping urban landscapes and lifestyles. Overall, the electric light bulb played a crucial role in the modernization of urban environments.