1) Serena Williams, an American tennis player, has won a total of 23 Grand Slam singles titles, making her one of the most successful players in the history of the sport.

2) The word "music" contains two vowels: U and I.

3) Kim Kardashian West is an American media personality, businesswoman, and socialite. She gained fame through reality television show "Keeping Up with the Kardashians" and has built a successful brand empire encompassing fashion, beauty, and other ventures.

4) The ocean covers about 71% of the Earth's surface and contains roughly 97% of the planet's water.