Attitudes changed after World War I broke out. The government and citizenry regarded the need to preserve coal used for heating homes. The Germans were the first to formally undertake the light-extending technique in 1915, being a gasoline-conserving evaluate during World War I. The subject took on new meaning in https://bookmarkfly.com/story14328386/how-wagging-tail-cat-clock-can-save-you-time-stress-and-money