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What's the Difference Between an Orchestra, a Symphony, and a Philharmonic?

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Remember when your brain exploded after your fourth grade math teacher told you “every square is a rectangle, but not every rectangle is a square!” Understanding the difference between an orchestra, a symphony, and a philharmonic is kind of like that. Every symphony is an orchestra, but not every orchestra is a symphony. Likewise, every philharmonic is a symphony, but not every symphony is a philharmonic.   

Okay, let’s take a breath. 

Orchestra is a broad term for any ensemble featuring a hefty lineup of strings. Two basic orchestras exist—chamber orchestras (small!) and symphony orchestras (big!). Chamber orchestras employ about 50 or fewer musicians (who may all play strings). As the name suggests, they play “chamber music”—older tunes written for private halls, aristocratic parlors, and glitzy palace chambers. Of course, contemporary composers still crank out chamber music, but the style peaked during the 17th and 18th centuries as wigged songsters like Haydn, Mozart, and Vivaldi tore up the scene.   

On the flip side, a symphony orchestra can boast more than 100 players, who are divided into strings, woodwinds, brass, and percussion. As that name suggests, they play “symphonies”— hulking pieces that usually require 18 to 25 different instruments. (Think of the heavy hitters of the 1800s: Beethoven, Brahms, Wagner, and company.)  

Essentially, if an orchestra is big enough to play a symphony, it’s a symphony orchestra. Simple!

Okay, maybe not.

A symphony orchestra and a philharmonic are the same thing—sort of. They’re the same size and they play the same kind of music. The two terms exist to help us tell different ensembles apart, especially in cities that boast multiple groups. For example: New York City is home to both the Brooklyn Philharmonic and the Brooklyn Symphony. They’re the same kind of orchestra, but they have different names so you don’t confuse them. The divide between symphony-philharmonic is just a matter of identity.

And that’s what makes them different. “Symphony orchestra” is a generic term, whereas “philharmonic orchestra” is always part of a proper name. So, you can call every philharmonic a symphony, but you can’t call every symphony a philharmonic—even though they’re the same.

And as for “pops?” That just means the orchestra isn’t afraid to let its hair down and play a jaunty show tune.

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Why Is the American Flag Displayed Backwards on Military Uniforms?
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In 1968, famed activist Abbie Hoffman decided to crash a meeting of the House Un-American Activities Committee in Washington by showing up in a shirt depicting the American flag. Hoffman was quickly surrounded by police, who ripped his shirt off and arrested him for desecration of the Red, White, and Blue.

Hoffman’s arrest is notable today because, while it might be unpatriotic to some, wearing the American flag, burning it, or otherwise disrespecting it is not a violation of any federal law. In 1989, the Supreme Court ruled that it would be unconstitutional to prosecute any such action. Still, Americans have very fervent and strict attitudes toward displaying the flag, a longstanding symbol of our country’s freedom. According to the U.S. Flag Code, which was first published in 1923, you shouldn’t let the flag touch the ground or hang it upside-down. While there’s no express prohibition about reversing the image, it’s probably a safe bet you shouldn’t do that, either.

Yet branches of the U.S. military are often spotted with a seeming mirror reflection of the flag on their right shoulder. If you look at a member in profile, the canton—the rectangle with the stars—is on the right. Isn’t that backwards? Shouldn’t it look like the flag on the left shoulder?

The American flag appears on a military uniform
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Not really. The flag is actually facing forward, and it’s not an optical illusion.

When a service member marches or walks forward, they assume the position of a flagpole, with the flag sewn on their uniform meant to resemble a flag flapping in the breeze. With the canton on the right, the flag would be fluttering behind them. If it were depicted with the canton on the left, the flag would be flying backward—as though it had been hung by the stripes instead of the stars nearest to the pole. The position of the flag is noted in Army Regulation 670-1, mandating the star field should face forward. The official term for this depiction is “reverse side flag.”

As for Hoffman: His conviction was overturned on appeal. In 1970, while at a flag-themed art show in New York, he was invited to get up and speak. He wore a flag shirt for the occasion.

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What Causes Sinkholes?
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This week, a sinkhole opened up on the White House lawn—likely the result of excess rainfall on the "legitimate swamp" surrounding the storied building, a geologist told The New York Times. While the event had some suggesting we call for Buffy's help, sinkholes are pretty common. In the past few days alone, cavernous maws in the earth have appeared in Maryland, North Carolina, Tennessee, and of course Florida, home to more sinkholes than any other state.

Sinkholes have gulped down suburban homes, cars, and entire fields in the past. How does the ground just open up like that?

Sinkholes are a simple matter of cause and effect. Urban sinkholes may be directly traced to underground water main breaks or collapsed sewer pipelines, into which city sidewalks crumple in the absence of any structural support. In more rural areas, such catastrophes might be attributed to abandoned mine shafts or salt caverns that can't take the weight anymore. These types of sinkholes are heavily influenced by human action, but most sinkholes are unpredictable, inevitable natural occurrences.

Florida is so prone to sinkholes because it has the misfortune of being built upon a foundation of limestone—solid rock, but the kind that is easily dissolved by acidic rain or groundwater. The karst process, in which the mildly acidic water wears away at fractures in the limestone, leaves empty space where there used to be stone, and even the residue is washed away. Any loose soil, grass, or—for example—luxury condominiums perched atop the hole in the ground aren't left with much support. Just as a house built on a weak foundation is more likely to collapse, the same is true of the ground itself. Gravity eventually takes its toll, aided by natural erosion, and so the hole begins to sink.

About 10 percent of the world's landscape is composed of karst regions. Despite being common, sinkholes' unforeseeable nature serves as proof that the ground beneath our feet may not be as solid as we think.

A version of this story originally ran in 2014.

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