1) The American Civil Rights Movement, led by figures like Martin Luther King Jr., fought for equal rights and helped bring about significant social and legislative changes.

2) The Great Barrier Reef in Australia is the largest living structure on Earth and can be seen from space.

3) 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.

4) The term "bull market" refers to a period of rising stock prices, while a "bear market" refers to a period of falling stock prices.