Mmmmmm....cake; sweet, fluffy and delicious. But what, exactly, turns a dense, wet mess of batter into a light, airy cake?
Here's a hint: It's not yeast, which you'll know if you've made a cake from scratch. Bread: yeast, beer: yeast, even some kinds of doughnuts: yeast. Cake?
If you want to know the one ingredient you must never, ever leave out of a cake, check out this video -- and try not to get too hungry.
Did you know the answer?
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Image via Debs/Flickr