Masthead invention of mankind

For each time period of our civilization is characterized by an invention that has made a breakthrough in the development of mankind. For example, the invention of the bow has enabled the first people to more efficiently procure provisions, however, later – better to go to war. The invention of wheel made it possible to make a leap forward, because it was possible to carry heavy loads, travel, etc. From time to time such inventions began to make a breakthrough in the development of our civilization, though, at first these inventions is rarely done, and every age, their frequency increased. The apogee of this was the twentieth century, which to an end just started to "shoot" very often different top-end inventions.
For example, now almost all have cell phones, without which many people simply can not imagine their lives, many of the bread will not buy a home, but the phone always put a few rubles. Now many people leaving the house, looking to whether they took the house keys, money and mobile phone, all other things automatically go by the wayside. Such is the life of a modern, well on the dash of inventions, so the same phone was 20 years ago available units, but now it is the privilege of millions of citizens.
Or is the great invention of the late twentieth century – the global network Internet, which is also a fairly short time has developed to such an extent that now, without it just hard to imagine a modern mankind. Now with the help of Internet chat, have fun, earn money. Now on the Internet to sell any services and products: tires, automobiles, appliances, jewelry, antiques, etc. etc.
Now, thanks to the Internet borders between states simply disappear, because having a computer, internet, people in free mode can communicate with each other, while being thousands of miles away from each other. At the same time they talk to each other and see each other.
Thanks to modern technology is much simpler lives, was definitely easier to live, of course, is itself the life more complicated, more and more become the commercial track. But thanks to technology has become easier to work, even if we take the example of the usual drive. Earlier, in order to get to an unknown destination by car, it was necessary to ask other people or to buy a map, now car navigator just replaced all of these manipulations.