Today I learned (@[email protected])

Attached: 1 image TIL that until recently, steel used for scientific and medical purposes had to be sourced from sunken battleships as any steel produced after 1945 was contaminated with radiation. https://en.wikipedia.org/wiki/Low-background_steel #til #todayilearned https://www.reddit.com/r/todayilearned/comments/1e3spph/til_that_until_recently_steel_used_for_scientific/