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

2) The most-watched TV series finale in the United States was "MAS*H," with an estimated 105 million viewers.

3) The word "mountain" contains three vowels: O, U, and A.

4) The first commercial GPS (Global Positioning System) was launched in 1989 and provided accurate positioning and navigation capabilities to users worldwide.