1) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active.

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

3) The human body contains enough carbon to make over 9,000 pencils.

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