My inner Biology geek is escaping...
So I'm in the process of making my first batch of yogurt. I'm 'improvising' since I really don't have the money to spend on a yogurt machine. My oven is an orange box with a heating pad in it. I lined it with a bath towel and I have another to cover the holes in the top of the box. Going to use a quart jar for my first time in case I screw it up I don't waste a half gallon of milk. I have some yogurt left from my Costco yogurt to start the culture with. I just heated my milk under boiling then I'm going to add a half cup of Costco (plain) yogurt and incubate in my homemade oven overnight. I'll keep you all posted if this actually works. :D