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

The researchers used 3D images to measure noses of more than 2,600 people from Africa, Asia and Europe. They measured width of the nostrils, distance between nostrils and nose height. The researchers said their findings could help people who move to different climates to adjust to heat or cold, and 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 in future. He said: "Our lifestyles aren't what they used to be. We move around world way too much. That makes it very complicated to predict future [evolution] of the nose with changing climate."

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