Wasn't sure how to title this.
Under the what would you do seeing this coming your way?
https://komonews.com/news/local/2-lb-balls-spilled-on-busy-seattle-street
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They look like the balls used in a ballmill to crush coal into a powder.
They pulverized coal is then burned as it drifts in the air in a boiler.
https://www.911metallurgist.com/blog/ball-mill
I know where my steel balls are. Ex-Wife has them.