Abstract
Each time we go to the refrigerator and take out a bottle of milk, we should be reminded of the work of the outstanding French scientist, Louis Pasteur. Pasteur discovered that milks turns sour because of the action of tiny living organisms too small to see with the naked eye. He developed a process of gently heating foodstuffs like milks to kill these organisms without changing the flavour or nutritional value. This process, named 'pasteurization' in honour of its developer, is just one of Pasteur's great contributions to mankind.