Why Do We Wish on the Turkey’s Wishbone?

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iStock

Although Thanksgiving is a North American holiday and a recent invention in the grand scheme of things, the tradition of breaking the wishbone comes from Europe, and is thousands of years older.

A bird’s wishbone is technically known as the furcula. It’s formed by the fusion of two clavicles, and is important to flight because of its elasticity and the tendons that attach to it. Clavicles, fused or not, aren’t unique to birds. You and I have unfused clavicles, also known as collarbones, and wishbones have been found in most branches of the dinosaur family tree.

The custom of snapping these bones in two after dinner came to us from the English, who got it from the Romans, who got it from the Etruscans, an ancient Italian civilization. As far as historians and archaeologists can tell, the Etruscans were really into their chickens, and believed that the birds were oracles and could predict the future. They exploited the chickens' supposed gifts by turning them into walking ouija boards with a bizarre ritual known as alectryomancy or “rooster divination.” They would draw a circle on the ground and divide it into wedges representing the letters of the Etruscan alphabet (which played a role in the formation of our own). Bits of food were scattered on each wedge and a chicken was placed in the center of the circle. As the bird snacked, scribes would note the sequence of letters that it pecked at, and the local priests would use the resulting messages to divine the future and answer the city’s most pressing questions.

When a chicken was killed, the furcula was laid out in the sun to dry so that it could be preserved and so that people would still have access to the oracle's power even after eating it. (Why the wishbone, specifically—and not, say, the femur or the ulna—is a detail that seems to be lost to history.) People would pick up the bone, stroke it, and make wishes on it, hence its modern name.

As the Romans crossed paths with the Etruscans, they adopted some of their customs, including alectryomancy and making wishes on the furcula. According to legend, the Romans went from merely petting the bones to breaking them because of supply and demand. There weren't enough bones to go around for everyone to wish on, so two people would wish on the same bone and then break it to see who got the bigger piece and their wish. This doesn’t make a whole lot of sense to me—Were there really that few chickens being slaughtered in Rome? If a resource is already scarce, why would you break what supply you do have into pieces?—but I can’t find much more than this about the bone-breaking aspect of the tradition.

Anyway, as the Romans traipsed around Europe, they left their cultural mark in many different places, including the British Isles. People living in England at the time adopted the wishbone custom, and it eventually came to the New World with English settlers, who began using the turkey’s wishbone as well as the chicken’s.

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Why Do People Get Ice Cream Headaches?

CharlieAJA, istock/getty images plus
CharlieAJA, istock/getty images plus

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.

Why Does Humidity Make Us Feel Hotter?

Tomwang112/iStock via Getty Images
Tomwang112/iStock via Getty Images

With temperatures spiking around the country, we thought it might be a good time to answer some questions about the heat index—and why humidity makes us feel hotter.

Why does humidity make us feel hotter?

To answer that question, we need to talk about getting sweaty.

As you probably remember from your high school biology class, one of the ways our bodies cool themselves is by sweating. The sweat then evaporates from our skin, and it carries heat away from the body as it leaves.

Humidity throws a wrench in that system of evaporative cooling, though. As relative humidity increases, the evaporation of sweat from our skin slows down. Instead, the sweat just drips off of us, which leaves us with all of the stinkiness and none of the cooling effect. Thus, when the humidity spikes, our bodies effectively lose a key tool that could normally be used to cool us down.

What's relative about relative humidity?

We all know that humidity refers to the amount of water contained in the air. However, as the air’s temperature changes, so does the amount of water the air can hold. (Air can hold more water vapor as the temperature heats up.) Relative humidity compares the actual humidity to the maximum amount of water vapor the air can hold at any given temperature.

Whose idea was the heat index?

While the notion of humidity making days feel warmer is painfully apparent to anyone who has ever been outside on a soupy day, our current system owes a big debt to Robert G. Steadman, an academic textile researcher. In a 1979 research paper called, “An Assessment of Sultriness, Parts I and II,” Steadman laid out the basic factors that would affect how hot a person felt under a given set of conditions, and meteorologists soon used his work to derive a simplified formula for calculating heat index.

The formula is long and cumbersome, but luckily it can be transformed into easy-to-read charts. Today your local meteorologist just needs to know the air temperature and the relative humidity, and the chart will tell him or her the rest.

Is the heat index calculation the same for everyone?

Not quite, but it’s close. Steadman’s original research was founded on the idea of a “typical” person who was outdoors under a very precise set of conditions. Specifically, Steadman’s everyman was 5’7” tall, weighed 147 pounds, wore long pants and a short-sleeved shirt, and was walking at just over three miles per hour into a slight breeze in the shade. Any deviations from these conditions will affect how the heat/humidity combo feels to a certain person.

What difference does being in the shade make?

Quite a big one. All of the National Weather Service’s charts for calculating the heat index make the reasonable assumption that folks will look for shade when it’s oppressively hot and muggy out. Direct sunlight can add up to 15 degrees to the calculated heat index.

How does wind affect how dangerous the heat is?

Normally, when we think of wind on a hot day, we think of a nice, cooling breeze. That’s the normal state of affairs, but when the weather is really, really hot—think high-90s hot—a dry wind actually heats us up. When it’s that hot out, wind actually draws sweat away from our bodies before it can evaporate to help cool us down. Thanks to this effect, what might have been a cool breeze acts more like a convection oven.

When should I start worrying about high heat index readings?

The National Weather Service has a handy four-tiered system to tell you how dire the heat situation is. At the most severe level, when the heat index is over 130, that's classified as "Extreme Danger" and the risk of heat stroke is highly likely with continued exposure. Things get less scary as you move down the ladder, but even on "Danger" days, when the heat index ranges from 105 to 130, you probably don’t want to be outside. According to the service, that’s when prolonged exposure and/or physical activity make sunstroke, heat cramps, and heat exhaustion likely, while heat stroke is possible.

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

This article has been updated for 2019.

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