1) The word "yesterday" contains three vowels: E, A, and A.

2) The film "Gone with the Wind" won eight Academy Awards, including Best Picture, and remains one of the highest-grossing films of all time when adjusted for inflation.

3) The Eiffel Tower can be 15 cm taller during the summer due to thermal expansion.

4) International relations encompass the study of relationships between nations, including diplomacy, treaties, and foreign policy. It examines the interactions and dynamics among different countries in the global arena.