invention changed the world

Wilhelm Roentgen made the discovery in the relatively mature age of 50 years, and quite by accident. Sat up late in the laboratory, the scientists found that the current in the cathode tube, closed on all sides by dense black paper affects crystals of barium platinotsianistogo lying nearby. Once Wilhelm include current, crystals began to glow. Another version has it that the wife of Roentgen brought his wife earned dinner, and when she put a plate of food on the table, between the tube and the screen, the scientist suddenly noticed how the bones of the hand through the translucent flesh.
Since ancient times, people have sought to create a machine that would lift them above the earth. But usually attempts to raise into the sky ended construction heavier than air is quite sad. Always something so lame. That frighten management, the planting will not be possible.

As a result, only in 1903, the Wright brothers managed to not only soar over other people, but also with respect to land successfully. Their unit "Flyer - 1" flew over the valley of the Kitty Hawk as much as 59 seconds, and covered the distance of 260 meters. This is a historic event and consider the inception of aviation.

However, the plane (or rather Glider) Wright brothers had a number of significant drawbacks. Without guide rails and tailwind "Flayre- 1" could not take off. But the apparatus of the Brazilian Santos-Dumont did not depend on the wind and take-off of the rails. He took off due to engine thrust. It is for this reason that Brazilians are confident that the palm of the invention is their country belongs to the aircraft.
Despite the fact that the first phone was demonstrated at the end of the XIX century, the first mobile phone appeared already in the 70s of the twentieth century. Father "handset" refers to Martin Cooper, an employee of Motorola. He worked then in the department for the development of portable devices, and when his colleagues saw a tube weighing more than a kilogram, then laughed. Nobody believed in the success of the new invention.

But the April 3, 1973, Martin Cooper made everyone believe in it "portable handset". Walking, in Manhattan, called Cooper with his "brick" the head of research at Bell Laboratories Joel Engel. The choice fell on this man's not a coincidence. Martin Company with Bell Laboratories led the fight for mobile communication and customer. So the father of "mobile telephones" showed who's in the field of portable devices.