1) 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.

2) Insurance fraud occurs when individuals or organizations deliberately deceive insurance companies to receive undeserved benefits.

3) Michael Jackson's album "Thriller" is the best-selling album of all time, with estimated sales of over 66 million copies worldwide.

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