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

2) The word "banana" contains three vowels: A, A, and A.

3) The tongue of a blue whale is so big that about 50 people could stand on it.

4) The world's oldest known living tree is a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.