View full lesson: http://ed.ted.com/lessons/the-chemistry-of-cookies-stephanie-warren You stick cookie dough into an oven, and magically, you get a plate of warm, gooey cookies. Except it's...
========== In a time-lapse video,
it looks like a monster coming alive.For a moment, it sits there innocuously.Then, ripples move across its surface.It bulges outwards,
bursting with weird boils.It triples in volume.Its color darkens ominously,
and its surface hardensinto an alien topography
of peaks and craters.Then, the kitchen timer dings.Your cookie is ready.What happened inside that oven?Don't let the apron deceive you!Bakers are mad scientists.When you slide the pan into the oven,you're setting off a series
of chemical reactionsthat transform one substance, dough,
into another, cookies.When the dough reaches
92 degrees Fahrenheit,the butter inside melts,causing the dough to start spreading out.Butter is an emulsion,or mixture of two substancesthat don'...
