1) 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.

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

3) The word "pencil" contains two vowels: E and I.

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