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Today, we inform you about a newly invented method that American milk farmers use. In this method, they create a huge hole in the cow's stomach. It works as a transparent window to the stomach. This may seem disgusting, but it helps to cows to live longer. 

This method is known as Fistula. Thanks to the Fistula farmers can check digestion process. It also helps to check the concentration during the digestion process. 

Moreover, farmers can insert medicines into the cow's body via this hole.
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