1) The Serengeti National Park, located in Tanzania and extending into Kenya, is renowned for its vast savannahs, diverse wildlife, and the annual wildebeest migration. It is a UNESCO World Heritage site and a popular destination for safari enthusiasts and nature lovers.

2) The United Nations (UN) is an international organization founded in 1945 with the goal of promoting peace, security, and cooperation among nations through diplomatic and political means.

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

4) Cyclones are fueled by warm ocean waters and atmospheric conditions that allow the formation of thunderstorms.