US National Popcorn Day
<p>In 1948 and 1950, two Harvard graduate students, the anthropologist Herbert Dick and the botanist Earle Smith, dug into the dry earth of Bat Cave in west-central New Mexico and pulled out tiny ears of corn, some smaller than a coin, that turned out to be roughly 5,600 years old. Later, on the northern coast of Peru, archaeologists working at the Paredones and Huaca Prieta sites between 2007 and 2011 found maize remains radiocarbon-dated to around 6,700 years ago, some of which would have popped. Long before there were cinemas or microwave bags, people in the Americas were heating hard little kernels until they burst. National Popcorn Day, observed across the United States on 19 January, sits on top of one of the deepest food histories on the continent.</p>
<h2 id="a-snack-older-than-writing">A snack older than writing</h2><div class="ad-unit ad-in-article" aria-label="Advertisement">
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<p>Popcorn is not a modern invention dressed up with a cute backstory; it is genuinely ancient. The specific magic of it depends on a particular kind of corn, <em>Zea mays everta</em>, whose kernels have a hard, moisture-sealing hull. Ordinary sweetcorn will not do this. The Peruvian and New Mexican finds show that Indigenous peoples were growing and eating popping maize thousands of years before European contact, and not only as food. Among various Indigenous communities, popped corn was strung as decoration and used in ceremonial contexts, which is why the snack carried cultural weight far beyond the cooking fire.</p>
<p>When European colonists arrived, Native communities introduced them to popped corn, and the habit spread quickly. By the nineteenth century, popping corn at home, in a pan or a wire basket over a flame, was an established American pastime, and seed sellers of the 1820s and 1830s were already listing distinct popping corns for the home gardener. What the snack still lacked was a way to make it reliably, in quantity, away from the kitchen.</p>
<p>It is worth pausing on a charming American myth that grew up around this history, because it shows how readily popcorn attracts folklore. Generations of schoolchildren were taught that the Wampanoag brought bags of popped corn to the first Thanksgiving in 1621. There is no evidence for this whatsoever, and good reason to doubt it: the flint corn grown in seventeenth-century New England does not pop in the dramatic way the story implies, and the tale appears to have been invented in the nineteenth century, long after the fact. The genuine antiquity of popcorn in the Americas is remarkable enough without the embellishment, which is perhaps why the invented version took hold so easily.</p>
<h2 id="charles-cretors-and-the-popping-cart">Charles Cretors and the popping cart</h2>
<p>That problem was solved in Chicago. In 1885 Charles Cretors, a confectioner originally from Lebanon, Ohio, took a commercial peanut roaster and rebuilt it, adding a steam-powered mechanism that stirred the kernels evenly in a kettle and seasoned them with butter as they popped. The result was the first practical mobile popcorn machine. Cretors mounted it on a cart and could now sell freshly popped, evenly cooked corn from a street corner, a park or a fair. He applied for a patent in 1891, was granted it in 1893, and showed his machine off to enormous crowds at the World’s Columbian Exposition in Chicago that same year. The Cretors family business still makes popcorn equipment well over a century later.</p>
<p>Cretors’s invention turned popcorn from a home treat into a commercial one, and it arrived at exactly the right moment. As public entertainment grew, so did the appetite for a cheap, portable snack to eat while watching it. The geography of supply fell into place around the same time. The American Corn Belt, and Indiana and Nebraska in particular, proved ideal for growing popping maize, and Indiana still vies for the title of the country’s largest producer; the founder of the brand that became Orville Redenbacher’s spent decades there breeding hybrids for ever-greater expansion. A snack with seven thousand years of history behind it was, within a single American generation, turned into an industry with its own machinery, its own seed science and its own supply chain.</p>
<h2 id="how-popcorn-took-the-cinema">How popcorn took the cinema</h2><div class="ad-unit ad-in-article" aria-label="Advertisement">
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<p>The marriage of popcorn and the movies was not love at first sight. Early cinema owners, anxious to be seen as respectable, often banned the noisy, messy snack from their plush auditoriums. The Great Depression changed their minds. Popcorn was cheap to produce and cheap to buy, a few cents bought a bag, which made it one of the few luxuries ordinary people could still afford in the 1930s. Street vendors set up outside theatres, and cinema owners, watching others profit from their queues, eventually moved the machines indoors and discovered that concessions could be more profitable than the films themselves.</p>
<p>By the 1940s the link was unbreakable. During the Second World War, sugar rationing crippled the sweet-confectionery trade and pushed popcorn even further forward as the snack of choice, and Americans were eating several times more of it than they had a decade before. The aroma of popping corn became part of the experience of going out, and it remains one of the most recognisable smells in any cinema lobby today. The economics have an unflattering logic to them: a multiplex makes only a thin margin on a ticket, much of which goes back to the studio, but the popcorn behind the counter is one of the most profitable products in all of retail, costing a few cents to produce and sold for several dollars. The buttered tub is, in a real sense, what keeps the lights on in the auditorium. The snack reaches its full familiarity through its modern partners on the snack calendar, sitting comfortably alongside indulgences such as <a href="/specialdate/national-ice-cream-day/">National Ice Cream Day</a> in the catalogue of foods Americans associate with leisure and a night out.</p>
<h2 id="the-science-of-the-burst">The science of the burst</h2>
<p>The reason popcorn pops at all is a small, precise piece of physics. Inside each kernel is a tiny amount of water, sealed by that tough hull. Heated to around 180 degrees Celsius, the water turns to steam and the pressure builds until the hull can no longer contain it. The kernel ruptures, the starchy interior gelatinises and expands explosively, and the whole thing turns itself inside out into the fluffy white shape on the plate. This is why a stale or over-dried kernel fails: lose the moisture and you lose the bang. The ideal is a hull holding around fourteen per cent water, which is why old kernels can sometimes be coaxed back to life by sealing them in a jar with a teaspoon of water for a few days. The pop itself is briefly violent, the kernel can leap to several times the height of the pan and the burst momentarily registers a small crack of sound, the audible sign of the hull giving way.</p>
<p>Popped kernels fall broadly into two shapes the trade calls “butterfly” and “mushroom.” Butterfly popcorn, with its irregular wings, is light and tender and favoured for eating by the bowl; the rounder, sturdier mushroom form holds up to coating, which is why it tends to end up in caramel corn and other confections. Growers chase a further measure called “expansion ratio,” the volume of fluff produced per unit of unpopped grain, and a premium hybrid can swell to forty or more times its original size. The handful of kernels that refuse to pop have their own folk name, “old maids” or “spinsters,” and they fail almost always for the same reason: too little moisture left inside to flash into the steam that drives the explosion. That same versatility puts popcorn in the same family of customisable, season-it-yourself snacks as the savoury staples celebrated on dates like <a href="/specialdate/national-potato-chip-day/">National Potato Chip Day</a>.</p>
<h2 id="fun-facts">Fun facts</h2>
<ul>
<li>The oldest known popcorn-suitable maize, found on the Peruvian coast, has been dated to roughly 6,700 years ago, older than the pyramids of Giza.</li>
<li>Charles Cretors patented his steam-powered popcorn machine in 1893 and demonstrated it at the same Chicago World’s Fair that introduced the Ferris wheel.</li>
<li>Cinemas originally banned popcorn for being too messy and lowbrow; it was the Depression that turned it into the defining cinema snack.</li>
<li>Popcorn pops because water sealed inside the kernel flashes to steam at around 180°C and bursts the hull, turning the starchy centre inside out.</li>
<li>Only the variety <em>Zea mays everta</em> pops properly; standard sweetcorn lacks the hard, moisture-trapping hull needed to build the pressure.</li>
</ul>
<h2 id="a-closing-reflection">A closing reflection</h2>
<p>It is worth pausing on the sheer span of time a bowl of popcorn covers. The same trick that delighted people in coastal Peru nearly seven thousand years ago, sealing water in a hard shell and heating it until it explodes, is the one playing out in a microwave bag tonight. Charles Cretors industrialised it, the Depression-era cinema commercialised it, and physics has never changed the rules. There are foods that connect us to recent history and foods that connect us to deep time; popcorn manages, improbably, to do both, which is a great deal to think about over a snack that costs almost nothing and is gone in minutes.</p>
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