Also, I am talking glyphosate, not Roundup. I don't know anyone that thinks Roundup is safe. It is a complex mix of tons of other crap so it can pretty much kill anything.

At work we use glyphosate mixed with a surfactant that is essentially like vegetable oil. It doesn't kill everything but it does a good job on the stuff we want to hit.
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Maybe he's born with it.

Maybe it's amphetamines.