1) The Appalachian Mountains, running along the eastern coast of the United States, are one of the oldest mountain ranges in the world.

2) The musical "Les Misérables" is one of the longest-running shows in the West End and Broadway, with over 13,000 performances.

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

4) The Triple Double in basketball refers to a player achieving double-digit totals in three of the following statistical categories: points, rebounds, assists, steals, or blocks.