1) The Earth's core is hotter than the surface of the Sun.

2) Sir Elton John, born Reginald Kenneth Dwight, is an English singer, songwriter, and pianist. With a career spanning over five decades, he is one of the best-selling music artists in the world and has received numerous awards and accolades for his contributions to music.

3) The word "island" contains two vowels: I and A.

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