I recently picked up a yoghurt maker for AUD $10. (That's less than £7.50.) I'm about to try to make my first batch of dairy free yoghurt (being allergic to dairy, this makes sense to me!) and I was wondering why the instructions tell me I must bring the soya milk to the boil and allow it too cool to 40ºC before mixing in the live (dairy free) yoghurt whilst I don't have to do this with cow's milk. More importantly, do I have to do this with other non-dairy milks or is it just with soya milk?