Question: What happens after the foam cools in popcorn?
About the article "Popcorn", section "Popping mechanism".

Candidate passages:
Each kernel of popcorn contains a certain amount of moisture and oil.
Unlike most other grains, the outer hull of the popcorn kernel is both strong and impervious to moisture and the starch inside consists almost entirely of a hard, dense type.
As the oil and the water around the kernel are heated, they turn the moisture in the kernel, which has a moisture-proof hull, into a superheated pressurized steam.
Under these conditions, the starch inside the kernel gelatinizes, softens, and becomes pliable.
The pressure continues to increase until the breaking point of the hull is reached: a pressure of about and a temperature of .
The hull ruptures rapidly, causing a sudden drop in pressure inside the kernel and a corresponding rapid expansion of the steam, which expands the starch and proteins of the endosperm into airy foam.
As the foam rapidly cools, the starch and protein polymers set into the familiar crispy puff.
Special varieties are grown to give improved popping yield.
Some wild types will pop, but the cultivated strain is "Zea mays everta", which is a special kind of flint corn.
Popcorn, threaded onto a string, is used as a wall or Christmas tree decoration in some parts of North America, as well as on the Balkan peninsula.
Some shipping companies have experimented with using popcorn as a biodegradable replacement for expanded polystyrene packing material.
However, popcorn has numerous undesirable properties as a packing material, including attractiveness to pests, flammability, and a higher cost and greater density than expanded polystyrene.
A more processed form of expanded corn foam has been developed to overcome some of these limitations.
The world's largest popcorn ball was unveiled in October 2006 in Lake Forest, Illinois.
It weighed , measured in diameter, and had a circumference of . 
In the 1960s or 70s, Sutton was given the nickname of "Popcorn" Sutton after damaging a bar's faulty popcorn vending machine with a pool cue. 
Popcorn seasoning can refer to a variety of seasonings that are used to add flavor to popcorn.
In the United States, popcorn seasoning is mass-produced by several companies for commercial and consumer use.
Popcorn seasonings may be used to enhance the flavor of popcorn, and some are used to add a buttery flavor to popcorn.
Significant amounts are often used to ensure the adequate flavoring of popcorn, due to popcorn's low density.
It is also sometimes utilized to add coloring to popcorn.
Some popcorn seasoning may contain monosodium glutamate.
Some specialty products exist in unique flavors, such as chocolate and bubble gum.
Dry popcorn seasoning may be finely granulated to enable even dispersion upon popcorn.
Some oils used to cook popcorn contain popcorn seasonings mixed within the oil, and may be referred to as popcorn seasoning oils or liquid popcorn seasoning.
Common homemade popcorn seasoning ingredients include salt and melted butter.
Some popcorn seasoning products may be referred to as popcorn salt. 
Popcorn is an unincorporated community in Perry Township, Lawrence County, Indiana.
The town has been popularized by the advertising campaign for Dale and Thomas Popcorn and its retail brand.