Add about an inch of water to a tall stockpot and place a steamer rack in the bottom. Heat the water to a simmer. Heat the milk in the microwave or in a small saucepan on the stove until very warm, 90 ...
[UPDATE: The photo of the bread experiment was originally taken by Courtney Lee Simpson, a pre-K teacher from Oak Ridge, Tenn. It has been shared and reposted hundreds of thousands of times, including ...