People jumping out of windows in 1929 was a hoax made up by Winston Churchill trying to convince poor people that rich people were hurting too. One drunk tourist fell off a balcony before the crash, and Churchill manipulated it for propaganda. The first actual suicide on Wall Street in the weeks after the crash was a clerk in her 20s worked to death by her bosses getting rich off the volatility using her as a human high frequency trading computer.

They put a plug in the bottom that melts if the salt gets too hot and it drains out into a tank that stops the reaction with no moving parts or anyone controlling it. After it cools down they can remelt it and put it back in.