In old times, people did not know much, in fact they did not even know about fire or what is fire! But the next generation discovered fire and the next one discovered how to light fire. Eventually, mankind evolved and invented matches and heaters. First, gas heaters were made, which are still in use, and then electric heaters were invented, which are also used in the present. Because of matches, one can go anywhere with the easiest way to light fire. All one has to do is get some sticks and ignite a match and done.
The example above is only one , there are many other examples that tell us how much mankind has evolved. Let us take another example, when telephones were not invented, the only way of communicating with each other was to write letters. Letters took much time to reach their destinations and sometimes they did not reach at all. But when in 1876, Alexander Graham Bell invented telephones, communication got easier. Communication got even more easier when mobile phones, which were wireless, were invented in 1983 by Martin Cooper.
Since the dawn of time, mankind has been through a lot. First man lived in caves, then they built houses from wood. Eventually they began making houses from mud-bricks. The new generations came to know more then the old ones. Every generation contributed in the evolution of mankind. The newest generation is better from all the rest and that is the good change.