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 Tour de France, first held in 1903, is one of the most prestigious and grueling cycling races, covering over 3,500 kilometers (2,200 miles) in three weeks.

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

4) The word "school" contains two vowels: O and O.