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

2) A single bolt of lightning can heat the surrounding air to temperatures five times hotter than the surface of the sun.

3) Michael Phelps, an American swimmer, has won a total of 28 Olympic medals, including 23 gold medals, making him the most decorated Olympian of all time.

4) Banks play a vital role in the economy by facilitating the flow of funds between savers and borrowers, providing loans, and offering various financial services.