This has nothing to do with what type of animals you have. The organisms in play build up immunities or resistance and pass that along into the biosphere. Over time what used to work doesn't. Anyone with sheep or goats has seen this in a relatively short time. The chemical industry told us to use lots and lots of wormer and boy did we. We built up resistance in the worms, unknowingly of course, sold our stock and passed those resistant worms onto other people in other areas. If you sit in food court or at a movie next to some person that is carrying a strain of multiple drug resistant TB, you might pick it up and not know for months. Meanwhile you've passed it on to an untold number of people. Not everyone is going to show the symptoms or even know they have it until they get tested. But we don't "violate the rights" of our druggies and insane by putting them someplace we can ensure they get a full course of treatment for a disease and they spread this stuff around. The doc's keep passing out meds to keep the patients happy and get those kickbacks from the drug companies and then we wonder why medicine "A" doesn't seem to be as effective as it used to be. ( I won't even get into the hand sanitizer rage)
Yes, we brought this on ourselves through blissful ignorance and faith in industries that profited from indiscriminate use of their products.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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