It also helps to add a little bit of the cooled milk to the starter yogurt in a separate small bowl while whisking, then adding that back to the pot of milk so that the bacteria are brought up to temperature slowly. (davidlebovitz.com)
When I stir a pot of milk and sugar, I know it is going to reduce and turn thick and creamy. (happyandharried.com)
Ever wonder what would happen to a pot of milk if you simmered it slowly for two or more hours, down to almost nothing? (korenainthekitchen.com)