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A comment on Attempt to plug a wasp nest sparked the biggest wildfire in California history. Parent comment

Re:Attempt to plug a wasp nest sparked the biggest wildfire ... by lostlogin on Saturday June 08, 2019 @08:24AM (#20132009)
Steel tools on concrete can definitely make sparks. I assume it requires the aggregate in the concrete to be hard or the concrete to be very old and therefore hard. I’ve noticed this when breaking up concrete at night, a horrible chore.
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