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Cross dating technique

Dendrochronology or tree-ring dating is the scientific method of dating tree rings also called growth rings to the exact year they were formed. As well as dating them this can give data for dendroclimatology , the study of climate and atmospheric conditions during different periods in history from wood. Dendrochronology is useful for determining the precise age of samples, especially those that are too recent for radiocarbon dating , which always produces a range rather than an exact date. However, for a precise date of the death of the tree a full sample to the edge is needed, which most trimmed timber will not provide. It also gives data on the timing of events and rates of change in the environment most prominently climate and also in wood found in archaeology or works of art and architecture, such as old panel paintings. It is also used as a check in radiocarbon dating to calibrate radiocarbon ages.

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By Harriet Johnston For Mailonline. An unusual health technique that claims to change the shape of your jawline without surgery has snowballed in popularity online. Mewing is a technique that promises to help 'gain full genetic potential' in your facial features by moving the position of the tongue and teeth. There are hundreds of videos dedicated to the topic, with fans sharing before and after photographs online of their progress. Coined by a British dentist called Dr. Mike Mew, some believe that the position of your tongue can help define your jawline and align your upper and lower teeth, especially if they are crooked.

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Meditation has many health benefits and is a highly effective way to relieve stress and maintain a healthier lifestyle. Putting in the effort to learn and practice meditation can actually transform your experience of stress in your life. There are many different ways to meditate , and this technique is one of the most basic. With practice, you can use this technique to feel inner peace whenever you need it. Here's how to begin a basic meditation practice:.

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