In 1899, famous scientist Nikola Tesla built a giant tower in his laboratory in Colorado Springs. The tower began to catch a signal that seemed to be artificial. It turned out that it had been coming from an even greater height – from outer space! Then, in 1927, Norwegian radio engineer Jørgen Hals noticed something unusual. When he sent signals at a certain wavelength, they were sent back to him a few seconds later. At first, he thought it could be an ordinary radio echo, but was it really?
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