Steel...and a whole lot of other things...changed when the world when the first atomic bomb was tested in New Mexico in 1945.
Today's video details why the steel produced post-1945 isn't useful for anything needed to shield against radiation because it's radioactive itself...and why lead from Mediterranean shipwrecks is equally as useful.
Most of the video above is correct, though I will point out that "Scarpa Bay" is probably actually Scapa Flow. I know. I've been there.
Relatedly, check out Veritasium's video on how Kodak found out about the atomic bomb waaaaaay before the US government intended to tell anybody.
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