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Have you ever wondered why everyone's nose is a different shape? Researchers have come with a possible explanation this. A study from Pennsylvania State University in the USA says the Earth's climate could have something to do the shape our nose. The study found that people who have wider noses usually live warmer, more humid areas. People narrower noses are more commonly found colder and drier climates. The nose plays an important function in making sure the air we breathe reaches our lungs a warm and moist condition. The width the nostrils and length the nose help to make sure this happens. Researchers said the nose is a little like a temperature controller.

The researchers used 3D images to measure the noses more than 2,600 people from Africa, Asia and Europe. They measured the width the nostrils, the distance nostrils and nose height. The researchers said their findings could help people who move to different climates to adjust to the heat or cold, and the humidity. This could help reduce respiratory problems. Study co-author Dr Arslan Zaidi said increased travel and climate change make it difficult to predict if our nose will change shape the future. He said: "Our lifestyles aren't what they used to be. We move the world way too much. That makes it very complicated to predict the future [evolution] the nose the changing climate."

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