Nuclear Hotseat Episode 500! celebrates with a look back on 9-1/2 years of weekly updates on nuclear issues around the world. One of them: the Treaty to Prohibit Nuclear Weapons enters into International Force of Law as of this Friday, January 22, 2021! Fukushima, Three Mile Island, Church Rock all reviewed in interview excerpts w/Caldicott, Gundersen, Hutner, Zabarte, Paul, more! Producer/host Libbe HaLevy shares the tale of how it all came to be.