You are able to purchase manual fly sprays, fly tape that is strung on the ceiling of the barns, or a scratching mechanism that will automatically apply a fly repellent mixture to the animal as it scratches. You are able to purchase these at your local livestock feed or tack stores.
One of the most common ways to get rid of flies is the flytrap. These are available in a number of different forms. You can get the old-school fly strips, you can get baited flytraps that lure flies in with baits or pheromones, there's the classic bug zapper that your grandpa had, and there's even ultraviolet flytraps that kill flies by luring them into a sticky trap with their welcoming light.
If you need to be killing flies (and lots of them) indoors, there's a number of different foggers available. Look for one that is pyrethrin based. These will probably be among the least toxic.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.