1) The Brexit process, initiated by the United Kingdom's referendum in 2016, led to the country's withdrawal from the European Union in 2020, marking a significant political and economic change for both the UK and the EU.

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

3) The English alphabet has five vowels: A, E, I, O, and U.

4) 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.