We all have those moments. Your boss asks you to come in on a Saturday, your car decides not to start, or maybe you dribble coffee all over your favorite shirt. Next thing you know, a wave of emotion is welling up inside you -- anger, sadness, frustration, anxiety. In the heat of the moment, you want to yell, throw the nearest handy object, or just break down and cry. It can be difficult to deal with those strong emotions in a healthy, pro-active way.

We don't always have time to jet off to a yoga class to de-stress or other time-consuming calming techniques like a long walk outdoors or a phone call to your best friend. But these quick calming techniques can help if you're dealing with a rough day or even long-term stress.

We've researched the quickest ways to calm down when you're feeling stressed. These science-backed calming techniques are a great way to lower your heart rate and provide some quick stress relief whenever and wherever you need it.

When a work confrontation gets you agitated or to calm your nerves before an important meeting, pop a piece of gum in your mouth. A study by the Centre for Occupational and Health Psychology at Cardiff University found evidence that "chewing gum can prevent the adverse effects of acute stress."

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When the pile of paperwork gets the best of you, or a project deadline is looming, take an instant break with Calm.com. The website (also available as an app on iOS) takes you through a guided, chill-out meditation right at your desk. You can choose from different nature scenes and select the length of your meditation (as short as two minutes or as long as 20 minutes), depending on how aggro you are.

We are officially giving you permission to watch YouTube videos because laughter really is the best medicine. Researchers have found that laughter reduces potentially harmful stress hormones in our bodies. So go watch that video of a cat playing banjo. It's good for you.

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If you've ever ridden the subway in New York City, you'll understand why so many people are plugged into their ear buds. Music can be a powerful mood-changer. So if your daily commute is making you tense or that shrieking kid in the airplane is grating on your last nerve, pipe into some relaxing music. Check out StereoMood.com, a website that creates playlists based on the kind of mood you're in (or want to get into).