what did people do before the electric battery was invented?
Human being passed through numerous phases in the advancement of energy sources. The fire was the earliest vital source of energy which comprises charcoal, peat, wood, straw, animal oil, and dried excrement. Nonetheless, the sun and wind played important role in the heating, lighting during the day, and refreshing. Moreover, the sources of communication were pacemakers, headphones tethered from home by a lengthy extension thread, and air conditioners.