Matt Novak, writing for Gizmodo:
On September 26, 1983, Soviet military officer Stanislav Petrov received a message that five nuclear missiles had been launched by the United States and were heading to Moscow. He didn’t launch a retaliatory strike, believing correctly that it was a false alarm. And with that, he saved the world from nuclear war. But now reports have surfaced that Petrov died this past May. He was 77 years old.