1) Online banking and mobile banking have become increasingly popular, providing convenient access to banking services through digital platforms.

2) 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.

3) Mountains are formed through various geological processes, including tectonic plate movements, volcanic activity, and erosion.

4) The world's largest desert is the Sahara Desert in Africa, covering an area of about 3.6 million square miles (9.4 million square kilometers).