1) Democracy is a system of government in which power is vested in the people, who exercise it through elected representatives. It allows for political participation, freedom of speech, and protection of individual rights and liberties.

2) The International Monetary Fund (IMF) and the World Bank are international financial institutions that work to promote global financial stability and economic development.

3) The world's oldest known living tree is a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

4) The highest-grossing concert tour of all time is U2's "360° Tour," which earned over $735 million in ticket sales.