1) The Earth's core is primarily composed of iron and nickel and is as hot as the surface of the sun.

2) The development of artificial intelligence (AI) has led to advancements in areas such as machine learning, natural language processing, and computer vision.

3) The ongoing Rohingya crisis in Myanmar has led to the displacement and persecution of the Rohingya people, drawing international attention and efforts to address the human rights violations and provide support to those affected.

4) The Alps, located in Europe, are a popular destination for skiing, mountaineering, and hiking.