Question: What's in a popcorn kernel
About the article "Popcorn", section "Popping mechanism".

Candidate passages:
Scheduled annually on the first Saturday after Labor Day, the Valparaiso Popcorn Festival is an all day event held in the downtown area of Valparaiso.
Included in the festivities are a 5-mile run (the Popcorn Panic), a block-long kiddie run (the Lit'l Kernel Puff), 5-mile walk, live entertainment, hundreds of food and craft vendors and the nation's 2d oldest Popcorn Parade.
Parade designers are encouraged to use popcorn in their float designs.
Early Festivals even offered free popcorn to every attendee. 
This is a list of popcorn brands.
Popcorn also known as popping corn, is a type of corn (maize, "Zea mays var.
everta") that expands from the kernel and puffs up when heated.
Popcorn is able to pop because its kernels have a hard moisture-sealed hull and a dense starchy interior.
Pressure builds inside the kernel, and a small explosion (or "pop") is the end result.
Some strains of corn are now cultivated specifically as popping corns.
Microwave popcorn is a convenience food consisting of unpopped popcorn in an enhanced, sealed paper bag intended to be heated in a microwave oven.
In addition to the dried corn the bags typically contain solidified cooking oil, one or more seasonings (often salt), and natural or artificial flavorings or both.
With the many different flavors, there are many different providers. 
Popcorn, also known as popping corn, is a type of corn (maize, "Zea mays var.
everta") that expands from the kernel and puffs up when heated.
Popcorn is able to pop because, like amaranth grain, sorghum, quinoa, and millet, its kernels have a hard moisture-sealed hull and a dense starchy interior.
Pressure builds inside the kernel, and a small explosion (or "pop") is the end result.
Some strains of corn are now cultivated specifically as popping corns.
There are various techniques for popping corn.
Along with prepackaged popcorn, which is generally intended to be prepared in a microwave oven, there are small home appliances for popping corn.
These methods require the use of minimally processed popping corn.
A larger-scale, commercial popcorn machine was invented by Charles Cretors in the late 19th century.
Unpopped popcorn is considered nonperishable and will last indefinitely if stored in ideal conditions.
Depending on how it is prepared and cooked, some consider popcorn to be a health food, while others caution against it for a variety of reasons.
Popcorn can also have non-food applications, ranging from holiday decorations to packaging materials. 
In popcorn jargon, a popped kernel of corn is known as a "flake".
Two shapes of flakes are commercially important.
"Butterfly" flakes are irregular in shape and have a number of protruding "wings".
"Mushroom" flakes are largely ball-shaped, with few wings.
Butterfly flakes are regarded as having better mouthfeel, with greater tenderness and less noticeable hulls.
Mushroom flakes are less fragile than butterfly flakes and are therefore often used for packaged popcorn or confectionery, such as caramel corn.
The kernels from a single cob of popcorn may form both butterfly and mushroom flakes; hybrids that produce 100% butterfly flakes or 100% mushroom flakes exist, the latter developed only as recently as 1998.
Growing conditions and popping environment can also affect the butterfly-to-mushroom ratio. 
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.