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Popcorn is a variety of corn kernel which expands and puffs up when heated. A popcorn kernel's strong hull contains the seed's hard, starchy core with 14–20% moisture, which turns to steam as the kernel is heated. Pressure from the steam continues to build until the hull ruptures, allowing the kernel to forcefully expand and then cool.

History

Corn was domesticated about 10,000 years ago, in what is now Mexico. Archaeologists discovered that people have known about popcorn for thousands of years. Fossil evidence from Peru suggests that corn was popped as early as 4,700 BC.

Through the 19th century, popping of the kernels was achieved by hand, on stove tops. Kernels were sold on the East Coast of the United States under names such as Pearls or Nonpareil. The term popped corn first appeared in John Russell Bartlett's 1848 Dictionary of Americanisms. Popcorn is an ingredient in Cracker Jack, and in the early years of the product it was popped by hand.

When to Use an Accordion

An accordion can improve the user experience — if used for the right reason and the right content. Let’s look at some use cases in which you should use an accordion.

When Not to Use an Accordion

When readers will need to click on the majority of accordion items: If users need to open the majority of accordion items, then it’s better to reveal all the content instead of hiding some. That way you won’t be forcing users to decide which headings to click on and to click on them one at a time, which can be cumbersome.
When you don’t have the resources to make it accessible: Accordions must be accessible, which is an additional development effort. If you don’t have the in-house support or budget required to meet accessibility standards, then it’s better to use plain text.

Icons

Icons, which typically appear to the left or right of the section titles, indicate there’s more content available if clicked. These icons might be an arrow pointing down or to the right, a caret, a plus sign, or a chevron pointing down, among others.

Often, there are two sets of icons used to indicate whether an item has been expanded or collapsed. In the example below, the plus icon of the expanded section is rotated so it looks like an “X”. When clicked again, the section will collapse and the icon will return to its original position.

Gallery of Puppies

Popcorn is a variety of corn kernel which expands and puffs up when heated. A popcorn kernel's strong hull contains the seed's hard, starchy core with 14–20% moisture, which turns to steam as the kernel is heated.

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