1) A group of flamingos is called a "flamboyance."

2) 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.

3) The concept of reinsurance, which is insurance for insurance companies, originated in the 17th century.

4) The concept of compound interest can be attributed to the ancient Babylonians, who used it in their banking practices.