Why Do People Get Ice Cream Headaches?

CharlieAJA/iStock via Getty Images
CharlieAJA/iStock via Getty Images

Reader Susann writes in to ask, "What exactly is the cause of brain freeze?"

You may know an ice cream headache by one of its other names: brain freeze, a cold-stimulus headache, or sphenopalatine ganglioneuralgia ("nerve pain of the sphenopalatine ganglion"). But no matter what you call it, it hurts like hell.

Brain freeze is brought on by the speedy consumption of cold beverages or food. According to Dr. Joseph Hulihan—a principal at Paradigm Neuroscience and former associate professor in the Department of Neurology at the Temple University Health Sciences Center, ice cream is a very common cause of head pain, with about one third of a randomly selected population succumbing to ice cream headaches.

What Causes That Pain?

As far back as the late 1960s, researchers pinned the blame on the same vascular mechanisms—rapid constriction and dilation of blood vessels—that were responsible for the aura and pulsatile pain phases of migraine headaches. When something cold like ice cream touches the roof of your mouth, there is a rapid cooling of the blood vessels there, causing them to constrict. When the blood vessels warm up again, they experience rebound dilation. The dilation is sensed by pain receptors and pain signals are sent to the brain via the trigeminal nerve. This nerve (also called the fifth cranial nerve, the fifth nerve, or just V) is responsible for sensation in the face, so when the pain signals are received, the brain often interprets them as coming from the forehead and we perceive a headache.

With brain freeze, we're perceiving pain in an area of the body that's at a distance from the site of the actual injury or reception of painful stimulus. This is a quirk of the body known as referred pain, and it's the reason people often feel pain in their neck, shoulders, and/or back instead of their chest during a heart attack.

To prevent brain freeze, try the following:

• Slow down. Eating or drinking cold food slowly allows one's mouth to get used to the temperature.

• Hold cold food or drink in the front part of your mouth and allow it to warm up before swallowing.

• Head north. Brain freeze requires a warm ambient temperature to occur, so it's almost impossible for it to happen if you're already cold.

This story has been updated for 2019.

What's the Difference Between a College and a University?

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Chinnapong/iStock via Getty Images

Going off to college is a milestone in any young adult’s life. The phrase itself conjures up images of newfound independence, exposure to new perspectives, knowledge, and possibly even one or more sips of alcohol.

In America, however, few people use the phrase “going off to university,” or “headed to university,” even if they are indeed about to set off for, say, Harvard University. Why did college become the predominant term for postsecondary education? And is there any difference between the two institutions?

While university appears to be the older of the two terms, dating as far back as the 13th century, schools and students in North America have embraced college to describe most places of higher learning. There is no rigid definition of the words, but there are some general attributes for each. A college is typically a four-year school that offers undergraduate degrees like an associate or a bachelor’s. (Community colleges are often two-year schools.) They don’t typically offer master’s or doctorates, and the size of their student body is typically the smaller of the two.

Universities, on the other hand, tend to offer both undergraduate and graduate programs leading to advanced degrees for a larger group of students. They can also be comprised of several schools—referred to as colleges—under their umbrella. A university could offer both a school of arts and sciences and a school of business. The University of Michigan has a College of Engineering, for example.

While many of these traits are common, they’re not guaranteed. Some colleges can be bigger than universities, some might offer master’s degrees, and so on. To complicate matters further, an institution that fits the criteria of a university might choose to call itself a college. Both Dartmouth College and Boston College qualify as universities but use the college label owing to tradition. Schools may begin as colleges, grow into universities, but retain the original name.

People tend to think of a university as being more prestigious or harder to get into, but there are too many variables to make that determination at a glance. Some colleges might ask more of applicants than universities. Some universities might be smaller than certain colleges. Either one can be public or private.

Things get a little more convoluted abroad. In the UK, students go off to university (or uni) instead of college. The British version of college is typically a two-year program where students either focus on learning one particular skill set (much like a vocational school) or use the time to prepare for exams so that they can advance to university. Language matters, too; in Spanish, colegio usually refers to high school.

While the terms aren’t strictly interchangeable, there is enough of a difference between the two to try and make the distinction. Keep in mind that some states, like New Jersey, have rules about how institutions label themselves. There, a university has to have at least three fields of graduate study leading to advanced degrees.

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Why Do We Eat Candy on Halloween?

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Jupiterimages/iStock via Getty Images

On October 31, hordes of children armed with Jack-o'-lantern-shaped buckets and pillow cases will take to the streets in search of sugar. Trick-or-treating for candy is synonymous with Halloween, but the tradition had to go through a centuries-long evolution to arrive at the place it is today. So how did the holiday become an opportunity for kids to get free sweets? You can blame pagans, Catholics, and candy companies.

Historians agree that a Celtic autumn festival called Samhain was the precursor to modern Halloween. Samhain was a time to celebrate the last harvest of the year and the approach of the winter season. It was also a festival for honoring the dead. One way Celtics may have appeased the spirits they believed still walked the Earth was by leaving treats on their doorsteps.

When Catholics infiltrated Ireland in the 1st century CE, they rebranded many pagan holidays to fit their religion. November 1 became the “feasts of All Saints and All Souls," and the day before it was dubbed "All-Hallows'-Eve." The new holidays looked a lot different from the original Celtic festival, but many traditions stuck around, including the practice of honoring the dead with food. The food of choice for Christians became "soul cakes," small pastries usually baked with expensive ingredients and spices like currants and saffron.

Instead of leaving them outside for passing ghosts, soul cakes were distributed to beggars who went door-to-door promising to pray for souls of the deceased in exchange for something to eat. Sometimes they wore costumes to honor the saints—something pagans originally did to avoid being harassed by evil spirits. The ritual, known as souling, is believed to have planted the seeds for modern-day trick-or-treating.

Souling didn't survive the holiday's migration from Europe to the United States. In America, the first Halloween celebrations were a way to mark the end-of-year harvest season, and the food that was served mainly consisted of homemade seasonal treats like caramel apples and mixed nuts. There were no soul cakes—or candies, for that matter—to be found.

It wasn't until the 1950s that trick-or-treating gained popularity in the U.S. Following the Great Depression and World War II, the suburbs were booming, and people were looking for excuses to have fun and get to know their neighbors. The old practice of souling was resurrected and made into an excuse for kids to dress up in costumes and roam their neighborhoods. Common trick-or-treat offerings included nuts, coins, and homemade baked goods ("treats" that most kids would turn their noses up at today).

That changed when the candy companies got their hands on the holiday. They had already convinced consumers that they needed candy on Christmas and Easter, and they were looking for an equally lucrative opportunity to market candy in the fall. The new practice of trick-or-treating was almost too good to be true. Manufacturers downsized candies into smaller, bite-sized packages and began marketing them as treats for Halloween. Adults were grateful to have a convenient alternative to baking, kids loved the sweet treats, and the candy companies made billions.

Today, it's hard to imagine Halloween without Skittles, chocolate bars, and the perennial candy corn debates. But when you're digging through a bag or bowl of Halloween candy this October, remember that you could have been having eating soul cakes instead.

Have you got a Big Question you'd like us to answer? If so, let us know by emailing us at bigquestions@mentalfloss.com.

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