WATCH YOUR BACK
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​A "cobble" happens when the rollers at a steel mill get jammed, allowing a knot of molten steel to build up until it flings a rope of hot steel into the air. It's not a huge problem, unless you aren't looking when it happens:

 


You can see the cobble (the big, glowing blob) on the right. 

When you're not concerned about someone getting hit, cobbles are actually quite beautiful:

 

[Via Reddit]

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