1) The assassination of Archduke Franz Ferdinand of Austria in 1914 triggered the start of World War I.

2) The word "computer" contains three vowels: O, U, and E.

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

4) The Dead Sea, bordered by Jordan to the east and Israel and Palestine to the west, is a hypersaline lake known for its high salt concentration. It is the lowest point on Earth's land surface and provides unique buoyancy, attracting visitors who enjoy floating in its waters.