Milk kefir grains are one of the few things in nature which have been described as eternal. As long as they are given the right nutrition they will continue to live and grow forever. It is not possible to create new kefir grains by bringing together the different strains of bacteria and yeast in a test tube, instead we have to rely on getting grains from someone else, so all the grains which exist now probably derive from the first source and are the product of people sharing this culture time and time again over perhaps thousands of years. It is easy to become a guardian of the grains and really easy to create your own live culture kefir at home for the price of milk. To learn more come on our Dairy Ferments Course this Sunday 2nd July at Gnome House,  Walthamstow, London E17, see our courses page for more details.