Why does milk turn into yogurt?
Tiny Party in Your Fridge
Why does milk turn into yogurt?
You open the fridge and there it is: a tub of yogurt, thick and tangy, sitting right next to the milk jug. Both came from a cow, but one you pour on cereal and the other you eat with a spoon. How did milk — that thin, sweet liquid — turn into this completely different thing?
The secret is bacteria. Tiny living creatures, millions of them, too small to see. When you add the right kind of bacteria to warm milk and let them hang out for a few hours, they throw a party that transforms everything.
