1) The first modern health insurance policy was introduced in Germany in the late 19th century.

2) In Norse mythology, the Valkyries are divine maidens who serve Odin, the chief god. They are responsible for selecting warriors worthy of entering Valhalla and escorting them to the afterlife. They are often depicted as powerful and beautiful figures, riding winged horses and wielding spears.

3) The word "guitar" contains three vowels: U, A, and I.

4) The word "mountain" contains three vowels: O, U, and A.