Users create this software themselves and often overlook how important it is. In some types of embedded systems, the application software and the operating system software may be indistinguishable to the user, as in the case of software used to control a VCR, DVD player or Microwave Oven.
You can jam milk through pretty small holes with force like that. Before homogenization, fat globules range in size from 1-10 microns (a micron = ~0.00004 inch). After, the size range is reduced to 0.2-2 microns.
Homogenization is the process by which fat globules in fluid milk are broken into sizes small enough that they will not rise in the milk to form cream under normal milk storage conditions. This is important for processing, storage and consumption of cow milk. In past times dietary energy was at a premium for humans.