Truth or Consequences, NM
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Glad you liked it, I am very into old flicks, Hitchcock made some dandy's.
I can see robots weeding, why not. People these days are into organic, no pesticides, and when we buy produce, how do we know what kind and how much are we ingesting? we simply don't know. Not that organics might be any better, without properly growing stuff in the fields, there's other things as we've seen of late, e coli, and other food borne illnesses.
Many different disease-causing germs(https://www.cdc.gov/foodsafety/diseases/index.html) can contaminate foods, so there are many different foodborne infections. CDC estimates that each year 48 million people get sick from a foodborne illness, 128,000 are hospitalized, and 3,000 die.
When I worked for the Lawrence County Highway Department in southern Illinois, we used paraquat to spray around bridges and some waterways to kill vegetation where it couldn't be mowed or chopped down, one worker developed a sore throat that lasted for days, plus she had nausea. She ended up going to a ER for treatment. Back then we weren't using masks, gloves or any protective equipment. The county just didn't provide us with any as I recall. Paraquat like roundup is very nasty stuff. My mom & dad used Sevin dust in their vegetable garden, you had to wash your veggies thoroughly before eating.