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) Kimchi is a traditional Korean side dish made of fermented vegetables, primarily cabbage and radishes, seasoned with chili pepper, garlic, ginger, and other spices. It is a staple in Korean cuisine and is known for its tangy and spicy flavors. Kimchi is rich in vitamins, minerals, and probiotics, making it not only a delicious accompaniment but also a healthy addition to meals.

3) The Treaty of Versailles, signed in 1919, officially ended World War I and imposed heavy penalties and reparations on Germany.

4) The Pacific Ocean is the largest ocean on Earth, covering more than 30% of the planet's surface.