13 Facts About Friday the 13th

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There are plenty of superstitions out there, but none have woven themselves into the fabric of our culture quite like Friday the 13th. It's inspired books, songs, and one of the most successful horror movie franchises of all time. But despite giving us anxiety, the origins of this notorious date on the calendar remain largely unknown to most. Where did it start? Does it really stretch back to the 14th century? And how does Loki figure into all of it?

There are a lot of urban legends and half-truths out there, so we're diving a bit deeper into the history of this most terrifying of days with 13 facts about Friday the 13th.

1. THE BIBLE HELPED INSPIRE THE PHOBIA.

The Last Supper
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Part of superstition surrounding Friday the 13th comes from the Christian Bible. During the Last Supper, there were 13 guests—Jesus and his 12 apostles, one of which, Judas, would eventually betray him. Since then, some have believed in a superstition regarding 13 guests at a dinner table. This slowly extended to be an overall feeling that the number itself was bad luck.

Of course, when Jesus was crucified, it took place on a Friday, leading some to view the day with an anxious eye. Taken separately, both the number 13 and Friday have since made their way into modern superstitions.

2. SO DID LOKI.

Guided by Loki, Höðr shoots the mistletoe at Baldr.
Guided by Loki, Höðr shoots the mistletoe at Baldr.
Wilhelm Wägner, Wikimedia Commons // Public Domain

The Last Supper is one view on the origins of our fear of 13. Another comes from Norse mythology—more specifically in the form of the trickster god Loki. In those stories, Loki tricked the blind god Höðr into killing his brother Baldr with a dart of mistletoe. Baldr's mother, Frigg, had previously ordered everything in existence to never harm her son, except the mistletoe, which she viewed as incapable of harm.

How does 13 figure into this? Some accounts say Baldr's death took place at a dinner held for 12 gods before it was interrupted by Loki—the 13th (and most unwanted) guest.

3. SOME POINT TO THE KNIGHTS TEMPLAR AS THE DAY'S ORIGIN (BUT IT'S PROBABLY NOT).

Jacques de Molay, the 23rd and Last Grand Master of the Knights Templar, is lead to the stake to burn for heresy in 1314.
Jacques de Molay, the 23rd and Last Grand Master of the Knights Templar, is lead to the stake to burn for heresy in 1314.
Hulton Archive, Getty Images

Contrary to what The Da Vinci Code told you, the reason people fear Friday the 13th isn't because of the Knights Templar. On the very unlucky Friday, October 13, 1307, Philip IV of France had members of the Templar arrested—growing uneasy with their power and covetous of their riches. There were trials, torture, and many of the Knights were burned at the stake, eventually leading to the superstition of Friday the 13th as a cursed and evil day.

That's not quite true, though. This is a take that's been drummed up in recent years, most visibly in Dan Brown's best-selling novel, but in reality, the unlucky combination of Friday and 13 didn't appear until around the turn of the 20th century.

4. A 1907 NOVEL PLAYED A BIG PART IN CREATING THE SUPERSTITION.

Panic on 'Black Friday' in the New York Gold Room, 1869.
Three Lions, Getty Images

We know a good deal about the history of our fear of 13 and of Fridays, but combined? Well, that's less clear. One popular thought, though, points to a 1907 book by a stockbroker named Thomas Lawson. Titled Friday, the Thirteenth, it tells the tale of a stockbroker who picks that particular day to manipulate the stock market and bring all of Wall Street down.

The book sold fairly well at the time, moving 28,000 copies in its first week. And it must have struck a chord with early 20th century society, as it's said to have caused a real-life superstition among stockbrokers regarding trading and buying stocks on the 13th. While not the first to combine the dates, Lawson's book is credited with popularizing the notion that Friday the 13th is bad news.

The fear among brokers was so real that in a 1923 New York Times article, it stated that people "would no more buy or sell a share of stock today than they would walk under a ladder or kick a black cat out of their path."

5. STOCKBROKERS HAVE REASON TO BE NERVOUS.

The 1873 rush from the New York Stock Exchange as banks began to fail and close, leading to a 10-day closure of the Stock Exchange.
Three Lions, Getty Images

Lawson's book was pure fiction, but the history of the stock market on Friday the 13th can be either profitable or absolutely terrifying, depending on the month. On most Friday the 13ths, stocks have actually risen—according to Time, they go up about 57 percent of the time, compared to the 52 percent on any other given date. However, if it's a Friday the 13th in October … be warned.

There's an average S&P drop of about 0.5 percent on those unlucky Fridays in October. And on Friday, October 13, 1989, the S&P actually saw a drop of 6.1 percent—to this day, it's still referred to as a "mini crash."

6. GOOD THINGS HAPPEN ON THAT DAY TOO, THOUGH! IT'S ALSO THE DAY HOLLYWOOD GOT ITS SIGN.

Hollywood sign on the hill
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On Friday, July 13, 1923, the United States got a brand new landmark as the famed Hollywood sign was officially christened as a promotional tool for a new housing development. But before the sign took on its familiar image, it initially read "Hollywoodland"—the full name of the development that was being built on the hills above Los Angeles. The sign took on its current “Hollywood” look in 1949 when, after two decades of disrepair, the Hollywood Chamber of Commerce decided to remove the last four letters and just maintain the first nine.

7. APPROPRIATELY, IT'S THE DATE HEAVY METAL WAS BORN.

Cover of Black Sabbath album
vinylmeister, Flickr // CC BY-NC 2.0

This one isn't exactly scientific, but don't tell that to a metalhead. According to heavy metal lore, the genre was born Friday, February 13, 1970, with the UK release of Black Sabbath's self-titled debut album. Bands like Steppenwolf had laid the foundation in the years before (Steppenwolf is also credited with coining the term "heavy metal" in their lyrics for 1968's "Born to Be Wild"), but those first dissonant "Devil's Tritone" chords of "Black Sabbath"—yes, the opening track of the album Black Sabbath by the band Black Sabbath was the song "Black Sabbath"—were the true birth of the dark, brooding, rocking subculture. Horns up.

8. THERE ARE SCIENTIFIC TERMS FOR THE PHOBIA.

Friday the 13th on a calendar
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Afraid of Friday the 13th? Well now you can put a name to your phobia. You likely already know the term triskaidekaphobia, which only applies to the fear of the number 13. But for specific fears of Friday the 13th, you can choose between paraskevidekatriaphobia (Paraskevi meaning Friday in Greek) or friggatriskaidekaphobia, based on the word Frigg, the Norse goddess that Friday was named after in English. (Remember, it was her son who Loki had killed …)

9. ONE INDIANA TOWN PUT BELLS ON EVERY BLACK CAT TO WARD OFF BAD LUCK.

Black cat wearing a bell.
Danilo Urbina, Flickr // CC BY NC-ND 2.0

The folks of French Lick, Indiana (Larry Bird's hometown) are apparently a superstitious lot. In the 1930s and extending into the '40s, the town board decreed all black cats in the town were to wear a bell around their neck every Friday the 13th. Apparently, the confluence of two popular phobias was a bit too much for the small Indiana town to handle.

10. FIVE PRESIDENTS WERE PART OF A CLUB TO IMPROVE THE NUMBER'S REPUTATION.

old-fashioned formal dinner
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Some people aren't just unaffected by the stigma of 13, they're downright defiant of it. In order to prove that there was no curse on the number, Captain William Fowler—who had fought in 13 Civil War battles—started a club in 1882 that spat in the face of superstition.

Members would meet on the 13th of the month, at 13 past the hour, and sit 13 at a dining table. For some, this behavior was just begging for a hex, but these men didn't care. They sought to disprove the myth and others along with it—open umbrellas lined the dining hall and members would willingly break glass, waiting for a so-called curse to befall them.

This wasn't just a club for eccentrics, either. Five presidents would become honorary members of The Thirteen Club: Chester Arthur, Grover Cleveland, Benjamin Harrison, William McKinley, and Theodore Roosevelt. In fact, Cleveland would take part while he was in office. In all, it's said that no man was struck down by any particularly curious fate (except perhaps McKinley, who was assassinated), despite having so blatantly tempted it.

11. IN ITALY, PEOPLE FEAR FRIDAY THE 17TH.

number 17 on a wooden background
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Italy's got the right idea, but they're a few days off. Traditionally, their fear coincides with the number 17, which can be arranged as the sum of the Roman numerals VIXI, which can then, in turn, be translated as the Latin phrase "I have lived." The overall superstition around Friday remains the same—it all has to do with Jesus's crucifixion.

This is no niche phobia, though. As ThoughtCo. points out, there are people who refuse to leave the house or go to work on Friday the 17th out of fear of the ominous date. And the Italian airline Alitalia doesn't even put a row 17 (or a 13) on its planes, as seen on this seat map [PDF].

12. THERE CAN'T BE MORE THAN THREE IN A GIVEN YEAR.

Calendar of 2015 with three Friday the 13ths
Calendar: iStock. Coloring: Mental Floss.

There's some good news if you're one of those people who are genuinely afraid of Friday the 13th: There can't be more than three in any given year, and it's possible to go as many as 14 months without one. There's an easy way to figure out if a month will have a Friday the 13th, too—if the month starts on a Sunday, you're guaranteed one. For 2018, 2019, and 2020, we get a bit of a break, as each year will only have two. This year, only April and July are affected.

13. AN ASTEROID WILL COME RELATIVELY CLOSE TO US IN 2029.

asteroid projection image
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Let's just get this out of the way: We'll be fine. An asteroid will not collide with the Earth on Friday, April 13, 2029. We will, however, get a pretty spectacular look at asteroid 99942 Apophis (also known as 2004 MN4), which is about 320 meters wide and would be devastating if it did hit. When the asteroid was first discovered in 2004, astronomers gave it a haunting 1-in-60 chance of colliding with Earth, but extra data has proved that it'll miss us entirely.

"We weren't too worried," Paul Chodas, of NASA's Near Earth Object Program, said, "but the odds were disturbing."

That's not to say the asteroid still won't be a sight to behold: Apophis will cruise past Earth 18,600 miles above ground. "For comparison," NASA wrote on its site, "geosynchronous satellites orbit at 22,300 miles." The asteroid will be mostly visible in parts of Asia, Africa, and Europe, and another event of this nature may not be seen for another 1000 or so years.

15 Scientific Ways to Relax for National Relaxation Day

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iStock

Today is National Relaxation Day, so you have a great excuse to take it easy. Here’s how science can help you have the most laid-back day of the year.

1. GET A HOUSE OR OFFICE PLANT.

Spending time in nature improves your overall wellbeing, but it turns out even just a little greenery is great for your health. Studies have shown patients in hospital rooms with plants report lower stress. Even just stepping into a lush space can reduce your heart rate. Plus, plants are effective at increasing oxygen and clearing out toxins, which should help you breathe easier—literally.

2. AVOID SCREENS BEFORE BEDTIME.

Artificial light from TV and computer screens affects melatonin production and throws off circadian rhythms, which messes with your sleep. Studies have found that young adults were more likely to suffer from sleep disorders, high stress and even depression if they reported intensive use of cell phones and computers at night.

3. LISTEN TO CLASSICAL MUSIC.

Any music you enjoy is bound to make you feel better, but classical music, in particular, has been shown to slow heart rate, lower blood pressure and even decrease levels of stress hormones.

4. DRINK GREEN TEA SWEETENED WITH HONEY.

Green tea contains L-theanine, which reduces stress, and honey—unlike cane sugar—has been shown to counteract free radicals and reduce inflammation, which is sometimes linked to depression.

5. GIVE YOURSELF A HAND MASSAGE.

Especially if you spend all day typing, hands can get really tense. A quick massage should be doable at your desk and if you incorporate some lavender-scented lotion, you’ll get extra relaxation benefits.

6. LOCK LIPS WITH SOMEONE.

Romance is relaxing! Kissing releases oxytocin, a chemical that is shown to reduce levels of the stress hormone cortisol.

7. CHEW GUM.

No matter what flavor it is, the act of chewing gum has been proven to lower cortisol and improve reported mood.

8. BLOW UP A BALLOON.

Reacting to stress with short, shallow breaths will only exacerbate the problem—your body needs more oxygen, not less, to relax. Blowing up a balloon will help you refocus on your breathing. No balloons around? Just concentrate on taking a few deep breaths.

9. MOW THE LAWN.

Research shows that a chemical released by a mowed lawn—that fresh-cut grass smell—makes people feel happy and relaxed. Plus, knocking it off your to-do list will give you one less thing to stress about.

10. FIND SOMETHING TO MAKE YOU LAUGH.

Watching a funny video online does more than just brighten your afternoon, it physically helps to relax you by increasing the endorphins released by your brain.

11. MUNCH ON CHOCOLATE.

What’s also good at releasing endorphins? Chocolate. Studies show that even just 40 grams of dark chocolate a day can help you de-stress.

12. EAT A BANANA.

Potassium helps your body regulate blood pressure. Keeping that under control should help you bounce back more quickly from what’s got you stressed.

13. MAKE ANOTHER TRIP TO THE FRUIT STAND.

Still hungry after that chocolate and banana? Try citrus. Recent studies show that vitamin C helps to alleviate the physical and psychological effects of stress.

14. FOCUS ON RELAXING ALL OF YOUR MUSCLES.

Take a break from whatever you’re doing and, starting at your toes and working upwards, spend a few moments slowly tensing, and then releasing, the muscles of each part of your body.

15. TAKE A MINI MENTAL VACATION.

If you’re feeling overwhelmed at work, take a moment to close your eyes and picture a particularly relaxing scene. It may sound cheesy, but numerous studies show that just a few minutes of disengaging from your stressors rejuvenates your ability to tackle the work.

7 Surprising Uses for Tequila

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iStock

Happy National Tequila Day! While you could celebrate by having a few drinks, you could also skip the hangover by unlocking one of tequila's amazing abilities outside of the glass. Many spirits are useful for activities beyond sipping (vodka, for example, is a great stain and odor remover), but tequila holds some particularly magical powers. Here are just a few of them.

1. SYNTHETIC BAUBLE

In 2008, a team of scientists in Mexico discovered that when the heated vapor from an 80-proof tequila blanco was combined with a silicon or stainless steel substrate, it resulted in the formation of diamond films. These films can be used in commercial applications, such as electrical insulators, or to create one big fake diamond. Who knew that spending $50 on a bottle of Don Julio was such a wise investment?

2. ALTERNATIVE ENERGY SOURCE

Keeping with the science theme: In 2011, researchers at England’s University of Oxford suggested that we may one day be gassing up our cars with tequila. They identified agave, the plant from which tequila is produced, as a potential biofuel source—and a particularly attractive one, as the plant itself is not consumed by humans and can thrive in desert climates.

3. WEIGHT LOSS SUPPLEMENT

Scientists have long promoted the potential benefits of the agave plant for its ability to help dissolve fats and lower cholesterol. The bad news? These properties get a bit diluted when the plant is distilled into alcohol. Even more so when it's whipped into a sugary margarita.

4. SLEEP AID

Take three or more shots of tequila and you’re bound to pass out. A single shot can have the same effect—just not in that drunken stupor kind of way. Relaxation is one of the positive side effects of tequila drinking; a small amount (1 to 1.5 ounces) before bedtime can reportedly help you fall asleep faster and sleep more soundly.

5. COLON CLEANSER

Too much of a good thing may not bring a welcome turn of events for your liver … but your colon will thank you! Researchers at Mexico’s University of Guadalajara have identified the blue agave as a potentially helpful source for delivering drugs to the colon in order to treat colitis, IBS, Crohn’s disease and even cancer.

6. DIABETES PREVENTATIVE

If Ernest Hemingway had known about the healing properties of tequila, his signature drink might have been a margarita instead of a daiquiri. In 2010, experiments conducted at Mexico’s Polytechnic Institute of Guanajuato revealed that the agave plant (which is high in fructans, a fructose polymer) could stimulate the GLP-1 hormone, aiding in increased insulin production.

7. COLD REMEDY

“Plenty of liquids” is a well-known remedy for getting oneself out from under the weather. But expanding that definition to include a kicked-up shot of tequila makes a day laid out on the couch sound much more appealing. In the 1930s, doctors in Mexico recommended the following concoction to fight off a cold.

.5 ounce of tequila blanco
.5 ounce of agave nectar (to eliminate bacteria and soothe sore throats)
.5 ounce of fresh lime juice (for Vitamin C)

Though some people (including tequila companies) swear by its healing powers, others say it's hogwash.

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