1) The Russian Revolution in 1917 resulted in the overthrow of the monarchy and the establishment of a communist government under Vladimir Lenin.

2) The word "computer" contains three vowels: O, U, and E.

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

4) The first successful portable MP3 player, the Diamond Rio PMP300, was released in 1998 and could hold up to 60 minutes of music.