The earliest yoghurts were probably spontaneously fermented by wild bacteria.

I am horrified at the way we breed and reproduce our ancestral bacteria and eat them alive . . . curd is truely the epitome of all evil. bacteria hamari mata hai. look on the tip of any nandi's nose and you'll know what i'm talking about . . . but then maybe we all need to get rid of our intestines . . . now wouldn't that be nice . . 6.3 billion human corpses . . bacteria party . . . what are you waiting for . . . insert hand swiftly and brutally and remove all bacteria!!