In one sentence, describe what the following article is about: You can use Messenger to make free voice calls. The recipient will need to be using either the Messenger app or the Facebook app, and will need to have their device connected to the internet. They can also receive calls using the Facebook website. Calls are currently only available with one recipient at a time. Group-calls or conference calls are not currently possible. The recipient will be notified that they are receiving a call, and will be able to pick up. If the button is grayed-out, the other person cannot currently receive phone calls. This may be because they are offline or are running an older version of the app. Once the call starts ringing, you can put your device up to your ear and talk just like you would a regular phone call. This will play the call audio loud so that you don't have to hold the phone to your ear. This will prevent the other person from hearing you until you turn mute off. The other person will be notified that you want to turn on video, and can either accept or deny the request. If the other person accepts, you'll be able to see each other using the cameras on your devices. When you receive a call on Messenger, your phone will ring with the special Messenger ringtone and you can answer it like you would a standard phone call.
Summary: Open a conversation with the person you want to call. Tap the "Phone" button to place a voice call. Put your device up to your ear. Tap the "Speaker" button to turn on speakerphone. Tap the "Mute" button to mute your audio. Tap the "Video" button to turn the call into a video call. Answer incoming calls like you would a regular call.

In one sentence, describe what the following article is about: There are many contortionist videos online that you can watch to get a better sense of contortionist movements and stretching. Look for videos that showcase contortion routines by trained professionals, as this will allow you to have a visual reference for your own contortion routine. Contortion classes can be found at performing arts schools, gyms, and yoga studios. Make sure the classes are taught by an experienced contortionist who uses safe and accessible exercises to deepen your stretches and movements. If you feel you have reached a certain point in your contortion training and are looking to try more advanced contortion movements, you may seek out a contortion coach, who is usually a contortionist themselves. A contortion coach can often be found by word of mouth in the performing arts community, online, or through an in person contortion class. Ask the instructor of your contortion class if she has any suggestions on contortion coaches who can work one on one with you.
Summary: Watch example videos online. Join a contortion class. Get one on one training with a contortion coach.

In one sentence, describe what the following article is about: A doctor can run an allergy test, which will help narrow down and even pinpoint exactly what allergen you are suffering from. Sometimes, they come back inconclusive or will indicate several allergies. The more information you can gather about your allergy, the better. Once you have a general idea of what causes your runny nose, you can start avoiding exposure to those allergens. Environmental irritants and allergens like pollen, pet dander and hair, dust, and cigarette smoke can all dry out nasal passages and start the runny nose cycle. Use an air purifier in your home to remove these irritants from the air, but recognize that it is virtually impossible to avoid all triggers unless you seal yourself inside an air-tight container.  One of the most common airborne allergens in the United States is ragweed pollen, and there are over 17 varieties. Although it is almost impossible to avoid exposure to ragweed completely, you can learn where high concentrations are likely to be located in your local environment. Avoid these locations as best you can. Avoid going outside during peak times, such as early morning, and close your windows when pollen counts are high. Reduce dust mites in your home by minimizing the presence carpeting, blankets, and stuffed animals. Use dust mite covers for mattresses and pillows. This is probably the most extreme way to protect yourself from the allergens that produce a runny nose. If the particles can’t get into your body, they can’t cause a runny nose. If you go outside during allergy season, wear a scarf over your nose and mouth. A protective face mask can do an even a better job. This will prevent allergens from spreading. Use soap and water. Any soap will work because you are only trying to remove allergens, not kill bacteria. Scrub your hands for at least 20 seconds. Rinse and dry your hands on a clean towel. If you are allergic to pet dander, wash your face after petting a dog. If you are allergic to pollen, then wash your face when you come indoors after being outdoors for a while. This will help reduce your exposure to allergens.
Summary:
Find out what you are allergic to. Avoid triggers. Cover your face. Wash your hands frequently. Wash your face after coming into contact with allergens.