1) J.K. Rowling's "Harry Potter" series of books has sold over 500 million copies worldwide and has been translated into 80 languages.

2) The naming of cyclones varies depending on the region. For example, cyclones in the Atlantic and eastern Pacific Ocean are named using a predetermined list of names.

3) The word "computer" contains three vowels: O, U, and E.

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