1) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

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

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

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