1) The world's largest volcano, Mauna Loa in Hawaii, is also one of the most active. It stands over 13,000 feet (4,000 meters) above sea level.

2) The world's most expensive car is the Bugatti La Voiture Noire, which sold for over $18 million.

3) The largest known dinosaur, Argentinosaurus, weighed around 70-100 tons and measured up to 100 feet in length.

4) The first sound film, "The Jazz Singer," was released in 1927 and marked the transition from silent movies to "talkies."