1) The corpse flower, or titan arum, is known for its unpleasant smell, often compared to that of rotting flesh.

2) The word "pencil" contains two vowels: E and I.

3) The construction of the Great Wall of China began in the 7th century BC and was completed over several centuries, spanning thousands of miles.

4) 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.