1) The word "country" contains three vowels: O, U, and Y.

2) The painting "The Scream" by Edvard Munch is an iconic work of art that depicts a figure in anguish and has become a symbol of existential angst.

3) The United States operates under a two-party system, with the Democratic Party and the Republican Party being the two major political parties that compete in elections and shape the country's political landscape.

4) The oldest known musical instrument is a flute made from a bird bone, estimated to be around 43,000 years old.