April 26, 4120 BCE — Bilbo Baggins is recruited by Thorin Oakenshield as a thief

It was a most Unexpected Party. Bilbo had no idea that he was going to be throwing it, for one thing.

But despite all the misunderstandings that Gandalf had apparently deliberately fostered (who says you can’t have a few laughs while you’re saving the world?), in the end, one bemused middle-aged hobbit with no prior experience at anything more challenging than walking down to the pub had agreed to travel halfway round the world with thirteen dwarves he didn’t know to steal things from a dragon. Because why not?

1986 – The Chernobyl Meltdown occurs

On April 26, 1986, a routine systems test of the number four reactor of the Chernobyl Nuclear Power Plant (near Pripyat, in the Ukraine) caused a power surge – and an attempt at a manual shutdown caused a second, larger surge, which in turn led a series of explosions, leading to a large fire. The smoke from this fire spread over large portions of Europe, from the Soviet Union to the Atlantic coast.

The disaster – alongside the Fukushima reactor event of 2011 – is the worst nuclear accident in history. Estimates of the resulting deaths vary, with 31 to 64 deaths being directly attributed to the disaster, and hundreds of thousands of deaths since then being attributed to secondary effects. A large area around the reactor has been evacuated (and remains so today), including the entire town of Pripyat, and the environmental effects are likely to remain for another century at least.

Referenced in:

Freakonomics — Clutch
Mrs. O — The Dresden Dolls