1) The Amazon rainforest produces more than 20% of the world's oxygen.

2) Michael Jackson's album "Thriller" is the best-selling album of all time, with estimated sales of over 66 million copies worldwide.

3) The concept of sovereignty refers to the supreme authority and power of a state to govern itself, make decisions, and control its own territory without interference from external forces.

4) The first sound film, "The Jazz Singer," was released in 1927 and marked the transition from silent movies to "talkies."