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Why Do They Click That Board Thing Before Filming A Movie Scene?

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Back in the stone age, you might remember, we had to record the events of our lives on video camcorders instead of our phones. These camcorders were great for amateur home use because they were pretty easy to use. Just point at something, hit a button and the audio and the video were recorded together in one place.

This is different than how things are done in Hollywood, where the images and sounds for movies are recorded separately. The images are captured on film by cameras, and the audio gets recorded on a separate analog or digital audio recorder (if a scene or set is particularly noisy, some productions might even have actors re-record their dialogue in a studio, in a process known as Automated Dialogue Replacement/Additional Dialogue Recording, or ADR).

The two parts have to be put back together in editing and carefully matched. To do that, it helps to have a way to synchronize the image and the sound. This where that clicky board thing comes in.

Called a clapperboard or a slate board, among other things, it’s used to make syncing audio and film easier and to identify takes and scenes. The clap or click of the board is easy for editors to pick out on the audio track and match to the visual of the clapper clapping on the film, syncing the moving picture with the sound.

The boards used to be made of actual pieces of slate, and later whiteboard, with the scene information written on them in chalk or marker. The relevant information includes the scene and take numbers, the camera angle, the date, the production title and the name of the director. The diagonal black and white lines usually seen on the hinged part that’s clapped down are there to ensure visibility.

Today, many larger productions have switched over to “digislates” or “smart slates.” These clapperboards display, in LED, a timecode generated by the audio recorder. The two are synced, and the board just has to be shown to the camera before a scene for the editors to find the same point in the film and audio tracks, no clap needed.

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Big Questions
What Are Curlers Yelling About?
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WANG ZHAO/AFP/Getty Images

Curling is a sport that prides itself on civility—in fact, one of its key tenets is known as the “Spirit of Curling,” a term that illustrates the respect that the athletes have for both their own teammates and their opponents. But if you’re one of the millions of people who get absorbed by the sport once every four years, you probably noticed one quirk that is decidedly uncivilized: the yelling.

Watch any curling match and you’ll hear skips—or captains—on both sides barking and shouting as the 42-pound stone rumbles down the ice. This isn’t trash talk; it’s strategy. And, of course, curlers have their own jargon, so while their screams won’t make a whole lot of sense to the uninitiated, they could decide whether or not a team will have a spot on the podium once these Olympics are over.

For instance, when you hear a skip shouting “Whoa!” it means he or she needs their teammates to stop sweeping. Shouting “Hard!” means the others need to start sweeping faster. If that’s still not getting the job done, yelling “Hurry hard!” will likely drive the point home: pick up the intensity and sweep with downward pressure. A "Clean!" yell means put a brush on the ice but apply no pressure. This will clear the ice so the stone can glide more easily.

There's no regulation for the shouts, though—curler Erika Brown says she shouts “Right off!” and “Whoa!” to get her teammates to stop sweeping. And when it's time for the team to start sweeping, you might hear "Yes!" or "Sweep!" or "Get on it!" The actual terminology isn't as important as how the phrase is shouted. Curling is a sport predicated on feel, and it’s often the volume and urgency in the skip’s voice (and what shade of red they’re turning) that’s the most important aspect of the shouting.

If you need any more reason to make curling your favorite winter sport, once all that yelling is over and a winner is declared, it's not uncommon for both teams to go out for a round of drinks afterwards (with the winners picking up the tab, obviously). Find out how you can pick up a brush and learn the ins and outs of curling with our beginner's guide.

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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Why You Should Never Take Your Shoes Off On an Airplane
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What should be worn during takeoff?

Tony Luna:

If you are a frequent flyer, you may often notice that some passengers like to kick off their shoes the moment they've settled down into their seats.

As an ex-flight attendant, I'm here to tell you that it is a dangerous thing to do. Why?

Besides stinking up the whole cabin, footwear is essential during an airplane emergency, even though it is not part of the flight safety information.

During an emergency, all sorts of debris and unpleasant ground surfaces will block your way toward the exit, as well as outside the aircraft. If your feet aren't properly covered, you'll have a hard time making your way to safety.

Imagine destroying your bare feet as you run down the aisle covered with broken glass, fires, and metal shards. Kind of like John McClane in Die Hard, but worse. Ouch!

Bruce Willis stars in 'Die Hard' (1988)
20th Century Fox Home Entertainment

A mere couple of seconds delay during an emergency evacuation can be a matter of life and death, especially in an enclosed environment. Not to mention the entire aircraft will likely be engulfed in panic and chaos.

So, the next time you go on a plane trip, please keep your shoes on during takeoff, even if it is uncomfortable.

You can slip on a pair of bathroom slippers if you really need to let your toes breathe. They're pretty useless in a real emergency evacuation, but at least they're better than going barefoot.

This post originally appeared on Quora. Click here to view.

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