Have you ever thought why everyone's nose is a different shape? Researchers have a possible explanation for this. A study from Pennsylvania State University says the Earth's climate could change the shape of our nose. The study found that people with wider noses usually live in warm, humid areas. People with narrower noses more commonly live in colder, drier places. The nose is important in making sure the air we breathe gets to our lungs in a warm and moist condition. The shape of the nose makes sure this happens. The nose is a little like a temperature controller.

Researchers used 3D images to measure the nose width and height, and the distance between the two nostrils of over 2,600 people from Africa, Asia and Europe. The researchers said their study could help people to adjust to the heat or cold, and the humidity if they travel to or live in other countries. It could help with breathing problems. A researcher said changing lifestyles, travel and climate change make it difficult to predict if our nose will always change shape. He said: "We move around the world way too much. That makes it…complicated to predict the future [evolution] of the nose."