1) The world's largest species of shark, the whale shark, can reach lengths of up to 40 feet (12 meters) and weigh over 20 tons.

2) The Industrial Revolution, which began in the 18th century, brought about significant changes in agriculture, manufacturing, mining, and transportation.

3) The fingerprints of koalas are so similar to humans that they have been mistaken at crime scenes.

4) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.