1) The national animal of Australia is the kangaroo.

2) The concept of separation of powers, as articulated by French philosopher Montesquieu, refers to the division of government responsibilities into distinct branches, such as the executive, legislative, and judicial, to prevent concentration of power.

3) The world's oldest known recipe is for beer and is over 4,000 years old.

4) The Hubble Space Telescope, launched in 1990, has provided breathtaking images of distant galaxies and deep space.