The Aberfan Disaster
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In 1966, a mining disaster in Aberfan, Wales, killed 144 people. It was a completely preventable tragedy, but none of the victims were in the mine itself, and 116 of them were children.
This was one of the worst disasters in Texas history, the worst school disaster in U.S. history, and it was a horrific tragedy that stemmed from a huge number of small decisions and moments.