OK. I once saw a program on TV which said you can make your own Yoghurt from... yoghurt.

Basically, the guy (on the TV) put yogurt in a large bowl and filled it up with milk. he left it overnight and the yoghurt quad-double-ruppled in size overnight.

Now, I don't know if the milk was warm or not? And I can't find a reference anywhere.

Looking on the Internet, I did find:

http://www.wikihow.com/Make-Yogurt
http://hubpages.com/hub/How_to_make_...ustrated_guide
http://www.allfreecrafts.com/giftina...e-yogurt.shtml
http://www.makeyourownyogurt.com/mak.../what-you-need

I must say. A very cultured thread.