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Previous video, in which we investigated the chemical composition of brownie skin:    • What is that glossy skin on brownies?  

My brownie recipe, with sweetened condensed milk and browned butter:    • Condensed milk and browned butter bro...  

Dr. Pia Sörensen at Harvard: https://sorensen.seas.harvard.edu/​

Dr. Sörensen's new book, "Science and Cooking: Physics Meets Food, From Homemade to Haute Cuisine": https://wwnorton.com/books/9780393634921