BACK TO THE CAVES ü Over the last century people’s lifes have completely changed <!--[if !supportAnnotations]--> [m1] <!--[endif]--> upside down. This is due to, above all, [the existence of] electricity. Nowadays, it has become crucial ü for every single activity we do, since <!--[if !supportAnnotations]--> [m2] <!--[endif]--> doing the shopping, or taking ü a warm bath; even when we are sleeping we relay on the alarm clock to go off ü and make us start a new day on time. If electricity didn’t exist, life would be totally ü different. First of all, we would have to adapt our lives to sunlight, reducing working time from eight to five hours in winter. And, as ü we wouldn’t have anything to do from sunset to dawn, we could sleep at least 9 hours every day!! When it comes to ü leisure time, we could only do outdoor activities, such as running, strolling ü , or going out with our friends. We had to learn how to survive <!--[if !suppo...