It is always interesting to go back to the past and see what people have been dreaming of. Their lives were different back then, and they imagined how our days would be in some incredible ways. If we look back at the people from a century ago and their way of imagining the future, we would be greatly surprised.
First of all, their expectations of progress were usually remote from what we have now. Sometimes they underestimated the way the things would develop; sometimes their expectations were too high. People often thought about spaceships, flying cars and cities on the Moon. Obviously, we have not reached this level of technologies yet.
Yet, sometimes, it is hard to believe how precisely some writers have described things that we have now.
Let us look at the most popular theories.