1) The first computer mouse was invented by Douglas Engelbart in 1964 and consisted of a wooden shell and two metal wheels.

2) The novel "To Kill a Mockingbird" by Harper Lee has been translated into more than 40 languages and has sold over 40 million copies worldwide.

3) The blue whale is the largest animal to have ever existed, with an average length of about 82 feet (25 meters).

4) Banks provide various financial products, including savings accounts, checking accounts, credit cards, mortgages, and investment services.