We all know it — cookies are delicious. The secret is in the ingredients. Flour, eggs, sugar, chocolate chips. Mix them all together and bake it in the oven and voila! Cookies! But how do cookies work? You stick cookie dough into the oven, and magically you get warm cookies out. But why doesn’t the chocolate melt everywhere in the cookie? How does the dough spread? Why does it have to be at a certain temperature?
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