It would be interesting to know the last time you had cream rise to the top of your milk... it's been homogenized here in the U.S. for many years. Homogenization is a process that is brought about by passing milk under high pressure through a tiny orifice, which results in a decrease in the average diameter and an increase in number and surface area, of the fat globules. It's the fat globules... cream... that rises to the top of the milk. Here in the western U.S., one can still buy raw milk from farmers and still separates if left overnight...