Final answer:
Mills have been used for various purposes throughout history, including removing lignin from Kraft pulp, removing proteins on contact lenses, converting starch, and using biomass as fuel. Stone grinding tools were also used for grinding various substances.
Step-by-step explanation:
Mills have been used for various purposes throughout history. In addition to grinding grains or starch, mills have been used to remove lignin from Kraft pulp, remove proteins on contact lenses to prevent infections, and convert starch into glucose and various syrups. For example, small power plants have also used biomass, such as woodchips, as fuel for generating electricity. Furthermore, in ancient Near Eastern food production, stone grinding tools were used for grinding not only nuts and cereals, but also meat, bark, minerals, salt, and herbs. Mills have been used for various purposes throughout history, including removing lignin from Kraft pulp, removing proteins on contact lenses, converting starch, and using biomass as fuel. Stone grinding tools were also used for grinding various substances.