Is milk milk?!

Is milk milk?

When I was a kid, milk standed three days before becoming undrinkable, them my mom used to make ricotta cheese of it.
Now milk can stay one month, after it, it just becomes something auful, impossible to make ricotta of it.
What happened to the milk?
Why humanity drinked whole milk for thousands of years as a healthy thing and now it's a sin if you buy 3% or 3.25% milk?

20 hours ago
As far as I know Pasteurization doesn't make milk stand for 30 days, neither it avoids milk to become Ricotta. It just kills some of the bacteria present at the moment of pasteurization. Homogenization is done because when you mix milk from many different cows it will not stand for even one day before decomposing. I saw Ricotta made from pasteurized and homogenized milk. Today's milk has something else.

Well-published research shows that health and safety fears are a leading factor in driving consumer food purchase choices. This is particularly true for mothers who purchase products they believe to be better for their family's health and well-being. In the case of milk, labels that claim to be "pesticide-free," "antibiotic-free" or "hormone-free" are misleading and in most cases simply false. All milk, for example, has hormones (over 25 different hormones are naturally found in milk), whether a cow received supplements to increase milk production or not.