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 world's oldest known living tree is a bristlecone pine named "Methuselah" in California, estimated to be over 4,800 years old.

3) The Indian Ocean is the third-largest ocean and is characterized by its warm waters and diverse marine life.

4) The highest-grossing concert tour of all time is U2's "360° Tour," which earned over $735 million in ticket sales.