1) The world's first paper money was created in China over 1,000 years ago.

2) The abolition of slavery in the United States was officially proclaimed with the ratification of the 13th Amendment to the Constitution in 1865.

3) Orchids are one of the largest families of flowering plants, with over 25,000 species.

4) The word "piano" contains three vowels: I, A, and O.