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Why Do Orchestras Tune to an A Note?

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When orchestra members tune their instruments before a performance, it almost always sounds the same. That’s because across the world, most orchestras tune to the same A note, using a standard pitch of 440 hertz.

This is the result of international standards that have been in place since the 19th century, according to WQXR, a classical music radio station in New York City. Currently, standard tuning frequency is set by the International Organization for Standardization (ISO), an international group that makes recommendations on everything from what safety labels should look like to how big the hole in a pen cap should be. A standard called ISO 16, first recommended in 1955 and confirmed in 1975, “specifies the frequency for the note A in the treble stave and shall be 440 hertz.”

The ISO didn’t pull that frequency out of thin air. During the Industrial Revolution, a rush toward standardization and universality led to multiple international meetings that aimed to bring orchestras all over the world to the same pitch. Standardizing pitch had important ramifications for the international music scene.

Historically, the pitch that orchestras tuned to could differ wildly depending on where the musicians were playing. “In the course of the last 400 years in Europe, the point that has been considered ideal for a reference pitch has fluctuated by some 5 or 6 semitones,” musicologist Bruce Haynes explained in his book, A History of Performing Pitch: The Story of ‘A.’ In the 17th century, a French performer might tune his or her instrument a whole tone lower than their German colleagues. The standards could even change from one town to the next, affecting how music written in one location might sound when played in another.

As a writer for London's The Spectator observed in 1859, “It is well known that when we are performing Handel's music (for example) from the very notes in which he wrote it, we are really performing it nearly a whole tone higher than he intended;—the sound associated in his ear with the note A, being nearly the same sound which, in our ear, is associated with the note G.”

In the 19th century, a commission established by the French government tried to analyze pitch across Europe by looking at the frequencies of the tuning forks musicians used as their reference while tuning their instruments. The commission gathered tuning forks from different cities, finding that most were pitched somewhere around 445 hertz. Over the years, due to bigger concert halls and more advanced instruments, pitch was rising across most orchestras, and instruments and voices were being strained as a result. So the commission recommended lowering the standard to what was known as “the compromise pitch.”

In 1859, the French commission legally established diapason normal, the standard pitch for the A above middle C, at 435 hertz. (The music world would still be debating whether or not pitch had risen too much more than a century later.) Later, 435 hertz became enshrined as a standard elsewhere, too. In 1885, government representatives from Italy, Austria, Hungary, Prussia, Russia, Saxony, Sweden, and Württemberg met to establish their own international standard, agreeing on 435 hertz. The agreement was eventually written into the Treaty of Versailles in 1919.

But not everyone was on board with 435 hertz. The Royal Philharmonic Society in London believed the French pitch standard was pegged to a specific temperature—59°F—and decided to adjust their pitch upward to compensate for their concert halls being warmer than that, settling on 439 hertz. Meanwhile, in 1917, the American Federation of Musicians declared 440 hertz to be the standard pitch in the U.S.

In 1939, the International Standardizing Organization met in London to agree on a standard for concert pitch to be used across the world. A Dutch study of European pitch that year had found that while pitch varied across orchestras and countries, the average of those varied pitches was around 440 hertz. So it made sense for the ISO to choose A 440. Furthermore, radio broadcasters and technicians like the BBC preferred A 440 to the English A 439 because 439 was a prime number and thus harder to reproduce in a laboratory.

World War II delayed the official launch of the 1939 ISO agreement, but the organization issued its A 440 decision in 1955, then again two decades later. A 440 was here to stay. That said, even now, pitch does vary a little depending on the musicians in question. The Vienna Philharmonic Orchestra notably tunes to 443 hertz rather than the standard 440 hertz, for instance. While A 440 may be the official “concert pitch” across the world, in practice, there is still a little wiggle room.

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What Happens When You Flush an Airplane Toilet?
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For millions of people, summer means an opportunity to hop on a plane and experience new and exciting sights, cultures, and food. It also means getting packed into a giant commercial aircraft and then wondering if you can make it to your next layover without submitting to the anxiety of using the onboard bathroom.

Roughly the size of an apartment pantry, these narrow facilities barely accommodate your outstretched knees; turbulence can make expelling waste a harrowing nightmare. Once you’ve successfully managed to complete the task and flush, what happens next?

Unlike our home toilets, planes can’t rely on water tanks to create passive suction to draw waste from the bowl. In addition to the expense of hauling hundreds of gallons of water, it’s impractical to leave standing water in an environment that shakes its contents like a snow globe. Originally, planes used an electronic pump system that moved waste along with a deodorizing liquid called Anotec. That method worked, but carrying the Anotec was undesirable for the same reasons as storing water: It raised fuel costs and added weight to the aircraft that could have been allocated for passengers. (Not surprisingly, airlines prefer to transport paying customers over blobs of poop.)

Beginning in the 1980s, planes used a pneumatic vacuum to suck liquids and solids down and away from the fixture. Once you hit the flush button, a valve at the bottom of the toilet opens, allowing the vacuum to siphon the contents out. (A nonstick coating similar to Teflon reduces the odds of any residue.) It travels to a storage tank near the back of the plane at high speeds, ready for ground crews to drain it once the airplane lands. The tank is then flushed out using a disinfectant.

If you’re also curious about timing your bathroom visit to avoid people waiting in line while you void, flight attendants say the best time to go is right after the captain turns off the seat belt sign and before drink service begins.

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Why is Friday the 13th Considered Unlucky?
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Today, people around the globe will feel uneasy about getting out of bed, leaving their homes, or going about their normal daily routines, all because of a superstition. These unfortunate folks suffer from paraskavedekatriaphobia, a common neurosis familiar to us all: the fear of Friday the 13th. But just where did this superstitious association come from, and how did it catch on?

The truth is that no one is absolutely sure where the idea that Friday the 13th is unlucky originated. Donald Dossey, the founder of the Stress Management Center and Phobia Institute in Asheville, North Carolina, suspects the fear can be traced back to a Norse myth about 12 gods who had a dinner at Valhalla—the fabled hall where legendary Norse heroes feasted for eternity after they died—that was interrupted by a 13th guest, the evil and mischievous god Loki.

According to legend, Loki tricked Höðr (the blind god of winter and son of Odin, the supreme god in Norse mythology) into shooting his brother Baldr (the benevolent god of summer who was also a son of Odin) with a magical spear tipped with mistletoe—the only substance that could defeat him. Thus the number 13 was branded as unlucky because of the ominous period of mourning following the loss of such powerful gods by this unwanted 13th guest.

For whatever reason, among many cultures, the number 12 emerged throughout history as a "complete" number: There are 12 months in a year, 12 signs of the zodiac, 12 Gods of Olympus, 12 sons of Odin, 12 labors of Hercules, 12 Jyotirlingas or Hindu shrines where Shiva is worshipped, 12 successors of Muhammad in Shia Islam, and 12 tribes of Israel. In Christianity, Jesus was betrayed by one of his 12 Apostles—Judas—who was the 13th guest to arrive for the Last Supper. Surpassing the number 12 ostensibly unbalances the ideal nature of things; because it is seen as irregular and disrespectful of a sense of perfection, the number 13 bears the stigma of misfortune and bad luck we know today.

WHY FRIDAY?

Friday joins in the mix mostly because all of the early accounts of Jesus’s crucifixion agree that it took place on Friday—the standard day for crucifixions in Rome. As Chaucer noted in The Canterbury Tales, "And on a Friday fell all this mischance." Yet perpetuating Friday as an unlucky day in America came from the late 19th-century American tradition of holding all executions on Fridays; Friday the 13th became the unluckiest of days simply because it combined two distinct superstitions into one. According to the Oxford University Press Dictionary of Superstitions, the first reference to Friday the 13th itself wasn’t until 1913. (So despite actually occurring on Friday, October 13, 1307, the popular notion that the Friday the 13th stigma comes from the date on which the famed order of the Knights Templar were wiped out by King Philip of France is just a coincidence.)

The repercussions of these phobias reverberated through American culture, particularly in the 20th century. Most skyscrapers and hotels lack a 13th floor, which specifically comes from the tendency in the early 1900s for buildings in New York City to omit the unlucky number (though the Empire State Building has a 13th floor). Some street addresses also skip from 12 to 14, while airports may skip the 13th gate. Allegedly, the popular Friday the 13th films were so-named just to cash in on this menacing date recognition, not because the filmmakers actually believed the date to be unlucky.

So, is Friday the 13th actually unlucky? Despite centuries of superstitious behavior, it largely seems like psychological mumbo jumbo. One 1993 study seemed to reveal that, statistically speaking, Friday the 13th is unlucky, but the study's authors told LiveScience that though the data was accurate, "the paper was just a bit of fun and not to be taken seriously." Other studies have shown no correlation between things like increased accidents or injuries and Friday the 13th.

And Friday the 13th isn't a big deal in other cultures, which have their own unlucky days: Greeks and Spanish-speaking countries consider Tuesday the 13th to be the unluckiest day, while Italians steer clear of Friday the 17th. So today, try to rest a little easy—Friday the 13th may not be so unlucky after all.

Additional Source: 13: The Story of the World’s Most Popular Superstition.

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