The relationship between energy and mass came out of another of Einstein's ideas, special relativity, which was a radical new way to relate the motions of objects in the universe. At one level, the equation is devastatingly simple.
Time and Tools. The most obvious difference between a cake and a cupcake is size, which depends on the container in which the dessert is prepared. Cakes are baked in large pans, usually round or square, and take half an hour or more to bake fully. Cupcakes, on the other hand, are baked in tins with several cups. Each cup is much smaller than a large cake pan, so a batch of cupcakes usually takes only about 15 minutes to bake.
Combine flour, baking powder, and salt; add to butter mixture alternately with milk, beginning and ending with flour mixture. Beat at low speed just until blended after each addition. (Batter will be thick.) Place 22 baking cups in 2 (12-cup) muffin pans; spoon 1/4 cup batter into each cup. Bake at 350Â° for 18 to 22 minutes or until a wooden pick inserted in center comes out clean. Remove from pans to wire racks, and cool completely (about 45 minutes). Pipe or spread Cream Cheese Frosting onto cupcakes.