Scandinavia and the World

Comments #9754282:

Thank you so much Petrov 20 4, 12:13pm

More specifically, Petrov instantly found it weird that only a single "missile" was detected. A first strike would've involved dozens or hundreds of missiles, which is why he waited and watched.

What's really scary is that there were several near misses that could've started a nuclear war, from human error to weather to bears.