"That time the US President, an expert in nuclear physics, heroically lowered himself into the reactor and saved Ottawa, Canada’s capital?"

 Via University of Ottawa physicist, Jeff Lundeen:

Do you remember the world’s very first nuclear meltdown? That time the US President, an expert in nuclear physics, heroically lowered himself into the reactor and saved Ottawa, Canada’s capital?

Sounds like schlocky action movie, but it actually happened! pic.twitter.com/LtAQYC79QZ

— Jeff Lundeen (@LundeenOttawa) December 15, 2021

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Transcript (skip past the Financial Times correction on LSD microdosing)

Also at The American Presidency Project at the University of California-Santa Barbara.