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It was thought by some that the core fire was extinguished by a combined effort of helicopters dropping more than 5,000 tonnes (11 million pounds) of sand, lead, clay, and neutron-absorbing boron onto the burning reactor. It is now known that virtually none of these materials reached the core.

https://en.wikipedia.org/wiki/Chernobyl_disaster

Re:Ask HN: What did you learn last week? on Sunday September 11, 2022 @04:31PM (#32803004)
From a comment here yesterday I learned the [2n] [2n+1] array layout for a binary tree is also known as the "Etyzinger" layout.

https://algorithmica.org/en/eytzinger#the-eytzinger-layout