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In a time-lapse video, it looks like a monster coming alive. 00:07
For a moment, it sits there innocuously. 00:10
Then, ripples move across its surface. 00:13
It bulges outwards, bursting with weird boils. 00:16
It triples in volume. 00:19
Its color darkens ominously, and its surface hardens 00:21
into an alien topography of peaks and craters. 00:24
Then, the kitchen timer dings. 00:28
Your cookie is ready. 00:30
What happened inside that oven? 00:32
Don't let the apron deceive you! 00:33
Bakers are mad scientists. 00:35
When you slide the pan into the oven, 00:38
you're setting off a series of chemical reactions 00:40
that transform one substance, dough, into another, cookies. 00:42
When the dough reaches 92 degrees Fahrenheit, 00:47
the butter inside melts, 00:50
causing the dough to start spreading out. 00:51
Butter is an emulsion, 00:54
or mixture of two substances 00:55
that don't want to stay together, 00:57
in this case, water and fat, 00:59
along with some dairy solids that help hold them together. 01:01
As the butter melts, its trapped water is released. 01:04
And as the cookie gets hotter, the water expands into steam. 01:07
It pushes against the dough from the inside, 01:10
trying to escape through the cookie walls 01:13
like Ridley Scott's chest-bursting alien. 01:15
Your eggs may have been home to squirming salmonella bacteria. 01:19
An estimated 142,000 Americans are infected this way each year. 01:22
Though salmonella can live for weeks outside a living body 01:27
and even survive freezing, 01:30
136 degrees is too hot for them. 01:31
When your dough reaches that temperature, they die off. 01:35
You'll live to test your fate with a bite of raw dough 01:38
you sneak from your next batch. 01:41
At 144 degrees, changes begin in the proteins, 01:43
which come mostly from the eggs in your dough. 01:47
Eggs are composed of dozens of different kinds of proteins, 01:49
each sensitive to a different temperature. 01:52
In an egg fresh from the hen, 01:55
these proteins look like coiled up balls of string. 01:56
When they're exposed to heat energy, 01:59
the protein strings unfold and get tangled up with their neighbors. 02:01
This linked structure 02:05
makes the runny egg nearly solid, 02:07
giving substance to squishy dough. 02:09
Water boils away at 212 degrees, 02:11
so like mud baking in the sun, 02:14
your cookie gets dried out and it stiffens. 02:16
Cracks spread across its surface. 02:19
The steam that was bubbling inside evaporates, 02:21
leaving behind airy pockets that make the cookie light and flaky. 02:24
Helping this along is your leavening agent, 02:27
sodium bicarbonate, 02:29
or baking soda. 02:31
The sodium bicarbonate reacts with acids in the dough 02:32
to create carbon dioxide gas, which makes airy pockets in your cookie. 02:35
Now, it's nearly ready for a refreshing dunk 02:40
in a cool glass of milk. 02:42
One of science's tastiest reactions 02:44
occurs at 310 degrees. 02:47
This is the temperature for Maillard reactions. 02:49
Maillard reactions result 02:52
when proteins and sugars break down and rearrange themselves, 02:54
forming ring-like structures, 02:57
which reflect light in a way 02:59
that gives foods like Thanksgiving turkey 03:00
and hamburgers 03:02
their distinctive, rich brown color. 03:03
As this reaction occurs, 03:06
it produces a range of flavor and aroma compounds, 03:08
which also react with each other, 03:11
forming even more complex tastes and smells. 03:12
Caramelization is the last reaction 03:16
to take place inside your cookie. 03:18
Caramelization is what happens 03:20
when sugar molecules break down under high heat, 03:22
forming the sweet, nutty, 03:25
and slightly bitter flavor compounds that define, well, caramel. 03:27
And, in fact, if your recipe calls for a 350 degree oven, 03:32
it'll never happen, 03:35
since caramelization starts at 356 degrees. 03:37
If your ideal cookie is barely browned, 03:40
like a Northeasterner on a beach vacation, 03:43
you could have set your oven to 310 degrees. 03:45
If you like your cookies to have a nice tan, 03:48
crank up the heat. 03:50
Caramelization continues up to 390 degrees. 03:51
And here's another trick: 03:55
you don't need that kitchen timer; 03:56
your nose is a sensitive scientific instrument. 03:58
When you smell the nutty, toasty aromas 04:01
of the Maillard reaction and caramelization, 04:04
your cookies are ready. 04:07
Grab your glass of milk, 04:08
put your feet up, 04:09
and reflect that science can be pretty sweet. 04:10

– English Lyrics

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Lyrics & Translation

[English]
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 hardens
into 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 reactions
that 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 substances
that don't want to stay together,
in this case, water and fat,
along with some dairy solids that help hold them together.
As the butter melts, its trapped water is released.
And as the cookie gets hotter, the water expands into steam.
It pushes against the dough from the inside,
trying to escape through the cookie walls
like Ridley Scott's chest-bursting alien.
Your eggs may have been home to squirming salmonella bacteria.
An estimated 142,000 Americans are infected this way each year.
Though salmonella can live for weeks outside a living body
and even survive freezing,
136 degrees is too hot for them.
When your dough reaches that temperature, they die off.
You'll live to test your fate with a bite of raw dough
you sneak from your next batch.
At 144 degrees, changes begin in the proteins,
which come mostly from the eggs in your dough.
Eggs are composed of dozens of different kinds of proteins,
each sensitive to a different temperature.
In an egg fresh from the hen,
these proteins look like coiled up balls of string.
When they're exposed to heat energy,
the protein strings unfold and get tangled up with their neighbors.
This linked structure
makes the runny egg nearly solid,
giving substance to squishy dough.
Water boils away at 212 degrees,
so like mud baking in the sun,
your cookie gets dried out and it stiffens.
Cracks spread across its surface.
The steam that was bubbling inside evaporates,
leaving behind airy pockets that make the cookie light and flaky.
Helping this along is your leavening agent,
sodium bicarbonate,
or baking soda.
The sodium bicarbonate reacts with acids in the dough
to create carbon dioxide gas, which makes airy pockets in your cookie.
Now, it's nearly ready for a refreshing dunk
in a cool glass of milk.
One of science's tastiest reactions
occurs at 310 degrees.
This is the temperature for Maillard reactions.
Maillard reactions result
when proteins and sugars break down and rearrange themselves,
forming ring-like structures,
which reflect light in a way
that gives foods like Thanksgiving turkey
and hamburgers
their distinctive, rich brown color.
As this reaction occurs,
it produces a range of flavor and aroma compounds,
which also react with each other,
forming even more complex tastes and smells.
Caramelization is the last reaction
to take place inside your cookie.
Caramelization is what happens
when sugar molecules break down under high heat,
forming the sweet, nutty,
and slightly bitter flavor compounds that define, well, caramel.
And, in fact, if your recipe calls for a 350 degree oven,
it'll never happen,
since caramelization starts at 356 degrees.
If your ideal cookie is barely browned,
like a Northeasterner on a beach vacation,
you could have set your oven to 310 degrees.
If you like your cookies to have a nice tan,
crank up the heat.
Caramelization continues up to 390 degrees.
And here's another trick:
you don't need that kitchen timer;
your nose is a sensitive scientific instrument.
When you smell the nutty, toasty aromas
of the Maillard reaction and caramelization,
your cookies are ready.
Grab your glass of milk,
put your feet up,
and reflect that science can be pretty sweet.

Key Vocabulary

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Vocabulary Meanings

innocuously

ɪˈnɒkjuəsli

C2
  • adverb
  • - In a way that is harmless or not likely to offend

ominously

ˈɒmɪnəsli

C1
  • adverb
  • - In a way that suggests that something bad is going to happen

topography

təˈpɒɡrəfi

C2
  • noun
  • - The physical features of an area of land or surface

deceive

dɪˈsiːv

B2
  • verb
  • - To cause someone to believe something that is not true

dough

dəʊ

B2
  • noun
  • - A thick, malleable mixture of flour and liquid used for baking

emulsion

ɪˈmʌlʃn

C2
  • noun
  • - A fine dispersion of minute droplets of one liquid in another in which it is not soluble

squirming

ˈskwɜːmɪŋ

C2
  • adjective
  • - Wriggling or twisting the body from side to side

tangled

ˈtæŋɡld

B2
  • adjective
  • - Twisted together untidily in a confused mass

squishy

ˈskwɪʃi

C1
  • adjective
  • - Soft and wet, yielding easily to pressure

evaporate

ɪˈvæpəreɪt

B2
  • verb
  • - To turn from liquid into vapor

flaky

ˈfleɪki

C1
  • adjective
  • - Breaking or separating easily into small, thin pieces

leavening

ˈlevənɪŋ

C2
  • noun
  • - A substance (such as yeast or baking powder) used to make dough rise

dunk

dʌŋk

C1
  • noun
  • - An act of dipping something briefly into a liquid
  • verb
  • - To dip food into a liquid before eating

distinctive

dɪˈstɪŋktɪv

B2
  • adjective
  • - Characteristic of one person or thing, serving to distinguish it from others

aroma

əˈrəʊmə

B2
  • noun
  • - A distinctive, typically pleasant smell

molecule

ˈmɒlɪkjuːl

B2
  • noun
  • - A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound

barely

ˈbeəli

B2
  • adverb
  • - Only just; almost not

crank

kræŋk

C1
  • verb
  • - To turn a handle or increase intensity/power (e.g., crank up the heat)

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