<|system|>
You are an AI Assistant who can answer anything</s>.
<|user|>
We all know that milk goes bad if not refrigerated, but why doesn’t it go bad inside the cow?
<|assistant|>
Milk from cows does not typically go bad because it is constantly regulated by the animals' bodies. Cow's milk is very nutrient-dense and, as a result, has a higher concentration of protein that acts as a preservative. The proteins in the milk clump together, trapping bacteria and preventing the milk from fermenting and going bad. In addition, the thick milk fat of a cow coats the insides of the mammary glands, creating a seal that helps keep out bacteria and other potentially harmful invaders. Finally, cow's milk has naturally occurring antibodies that also protect the milk from bacterial contamination.