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.
Making the world better, one answer at a time. Milk is a colloid, and is, in fact, heterogeneous because if you look at it under a microscope you can see little globs of fat, but under the naked eye it will look like it is homogeneous.