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

2) The average car has about 30,000 parts.

3) In Norse mythology, the Valkyries are divine maidens who serve Odin, the chief god. They are responsible for selecting warriors worthy of entering Valhalla and escorting them to the afterlife. They are often depicted as powerful and beautiful figures, riding winged horses and wielding spears.

4) The highest-grossing concert tour of all time is U2's "360° Tour," which earned over $735 million in ticket sales.